Skill updates

IXL is continually adding new skills and improving existing ones to offer fresh and exciting ways to learn. To accurately reflect the curriculum improvements, skill names and skill listings may be adjusted, but the permanent skill ID always stays the same. Use this page to discover new skills and find old favorites!

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Listing
Skill name and permanent skill ID
N.12
Write a quadratic function in standard form from its vertex and another point 4A7
N.12
→
N.13
Write a quadratic function in factored form from its x-intercepts and another point HPB
N.
→
N.14
Write a quadratic function in standard form from its x-intercepts and another point GGS
N.13
→
N.15
Write a quadratic function from three points ED9
N.16
Write a quadratic function: mixed review ECM
N.14
→
N.17
Interpret parts of quadratic expressions: word problems 9P2
P.1
Solve a system of linear and quadratic equations by graphing: parabolas
→
Solve a linear-quadratic system of equations by graphing: lines and parabolas VQU
P.2
Solve a system of linear and quadratic equations: parabolas
→
Solve a linear-quadratic system of equations: lines and parabolas HVZ
P.3
Solve a system of linear and quadratic equations: circles
→
Solve a linear-quadratic system of equations: lines and circles DKB
P.4
Solve a quadratic-quadratic system of equations by graphing: parabolas PJQ
Q.1
Factor theorem VXE
Q.4
Factor a polynomial given a root NCY
Q.1
→
Q.5
Solve polynomial equations
→
Solve cubic and quartic polynomial equations by factoring ZCH
Q.4
→
Q.6
Rational root theorem FCX
Q.5
→
Q.7
Complex conjugate theorem 5WU
Q.6
→
Q.8
Conjugate root theorems EYD
Q.7
→
Q.9
Descartes' Rule of Signs ZFB
Q.8
→
Q.10
Fundamental Theorem of Algebra YS8
Q.11
Find the roots of polynomials ZMG
Q.9
→
Q.12
Match polynomials and graphs using end behavior
→
Match polynomial functions and graphs using end behavior XMK
Q.10
→
Q.13
Match polynomials and graphs using zeros
→
Match polynomial functions and graphs using zeros 8CQ
Q.11
→
Q.14
Match polynomials and graphs
→
Match polynomial functions and graphs XJU
Q.12
→
Q.15
Domain and range of polynomials
→
Domain and range of polynomial functions Y86
Q.13
→
Q.16
Even and odd functions Q83
U.4
Add, subtract, multiply, and divide functions B82
U.4
→
U.5
Composition of linear functions: find a value MFV
U.5
→
U.6
Composition of linear functions: find an equation RSP
U.6
→
U.7
Composition of linear and quadratic functions: find a value P9T
U.7
→
U.8
Composition of linear and quadratic functions: find an equation EKJ
V.
→
V.4
Graphs of inverse functions K2W
V.4
→
V.5
Find inverse functions and relations ZRQ
X.2
Domain and range of reciprocal functions ULD
X.2
→
X.3
Evaluate rational expressions I RHV
X.3
→
X.4
Evaluate rational expressions II 9KA
X.4
→
X.5
Simplify rational expressions 37N
X.5
→
X.6
Multiply and divide rational expressions MG2
X.6
→
X.7
Add and subtract rational expressions FEX
X.8
Add, subtract, multiply, and divide rational expressions FLK
X.7
→
X.9
Simplify complex fractions YD8
X.8
→
X.10
Solve rational equations CHP
Z.9
Exponential growth and decay E5S
Z.9
→
Z.10
Exponential growth and decay: word problems TYQ
II.1
→
HH.1
Pythagorean Theorem and its converse JZF
II.2
→
HH.2
Special right triangles NUF
II.3
→
HH.3
Trigonometric ratios: sin, cos, and tan PQJ
II.4
→
HH.4
Trigonometric ratios: csc, sec, and cot P82
II.5
→
HH.5
Trigonometric ratios in similar right triangles XFA
II.16
→
HH.6
Trigonometric ratios: find a side length MHJ
II.17
→
HH.7
Trigonometric ratios: find an angle measure 84G
II.18
→
HH.8
Solve a right triangle DPP
HH.9
Trigonometric ratios: word problems HNV
HH.1
→
II.1
Convert between radians and degrees EDC
HH.2
→
II.2
Radians and arc length UA5
HH.3
→
II.3
Graphs of angles PSG
HH.4
→
II.4
Quadrants ANN
HH.5
→
II.5
Coterminal angles 7CV
HH.6
→
II.6
Reference angles BRP
II.6
→
JJ.1
Find trigonometric ratios using the unit circle
→
Determine trigonometric ratios using points on the unit circle ZF7
II.7
→
JJ.2
Sin, cos, and tan of special angles
→
Evaluate trigonometric ratios using reference angles: sin, cos, tan 6H8
II.8
→
JJ.3
Csc, sec, and cot of special angles
→
Evaluate trigonometric ratios using reference angles: sec, csc, cot PAE
II.9
→
JJ.4
Find trigonometric ratios using reference angles
→
Evaluate trigonometric ratios using reference angles 79Z
II.10
→
JJ.5
Find trigonometric functions using a calculator
→
Approximate trigonometric ratios using a calculator SPL
II.11
→
JJ.6
Inverses of sin, cos, and tan: degrees FCQ
II.12
→
JJ.7
Inverses of sin, cos, and tan: radians JVB
II.13
→
JJ.8
Inverses of csc, sec, and cot NJD
II.14
→
JJ.9
Solve trigonometric equations I
→
Solve trigonometric equations: sin, cos, tan CQB
II.15
→
JJ.10
Solve trigonometric equations II
→
Solve trigonometric equations SNX
JJ.1
→
KK.1
Law of Sines BSY
JJ.2
→
KK.2
Law of Cosines ZQB
JJ.3
→
KK.3
Solve a triangle YPP
JJ.4
→
KK.4
Area of a triangle: sine formula LNQ
JJ.5
→
KK.5
Area of a triangle: Law of Sines 5NP
KK.1
→
LL.1
Find properties of sine functions 2EK
KK.2
→
LL.2
Write equations of sine functions from graphs FGW
KK.3
→
LL.3
Write equations of sine functions using properties JDH
KK.4
→
LL.4
Graph sine functions 9NS
KK.5
→
LL.5
Graph translations of sine functions LCN
KK.6
→
LL.6
Find properties of cosine functions F8Y
KK.7
→
LL.7
Write equations of cosine functions from graphs 4G8
KK.8
→
LL.8
Write equations of cosine functions using properties N6X
KK.9
→
LL.9
Graph cosine functions KXG
KK.10
→
LL.10
Graph translations of cosine functions M5K
KK.11
→
LL.11
Find properties of sine and cosine functions 9S8
KK.12
→
LL.12
Write equations of sine and cosine functions from graphs 5XN
KK.13
→
LL.13
Write equations of sine and cosine functions using properties CWP
KK.14
→
LL.14
Graph sine and cosine functions A7V
KK.15
→
LL.15
Graph translations of sine and cosine functions 9D7
LL.1
→
MM.1
Complementary angle identities 89X
LL.2
→
MM.2
Symmetry and periodicity of trigonometric functions YBJ
LL.3
→
MM.3
Find trigonometric ratios using a Pythagorean or reciprocal identity XJJ
LL.4
→
MM.4
Find trigonometric ratios using multiple identities F8F
LL.5
→
MM.5
Trigonometric sum and difference identities A2Y
LL.6
→
MM.6
Solve trigonometric equations using sum and difference identities 8PV
MM.1
→
NN.1
Find terms of an arithmetic sequence C8R
MM.2
→
NN.2
Find terms of a geometric sequence BHV
MM.4
→
NN.3
Evaluate recursive formulas for sequences QB9
MM.5
→
NN.4
Classify formulas and sequences 2UZ
MM.6
→
NN.5
Write a formula for an arithmetic sequence H82
MM.7
→
NN.6
Write a formula for a geometric sequence Q5V
NN.7
Write a formula for an arithmetic or geometric sequence 5GM
MM.8
→
NN.8
Write a formula for a recursive sequence
→
Write a recursive formula for a sequence ZAH
MM.9
→
NN.9
Convert a recursive formula to an explicit formula GXK
MM.10
→
NN.10
Convert an explicit formula to a recursive formula TPQ
MM.11
→
NN.11
Convert between explicit and recursive formulas RGQ
MM.12
→
NN.12
Sequences: mixed review 2MX
NN.1
→
OO.1
Identify arithmetic and geometric series HS9
NN.2
→
OO.2
Introduction to sigma notation
→
Write a series using sigma notation DHQ
NN.3
→
OO.3
Find the sum of an arithmetic series W6A
NN.4
→
OO.4
Find the sum of a finite geometric series 9KQ
NN.5
→
OO.5
Introduction to partial sums AGV
NN.6
→
OO.6
Partial sums of arithmetic series 7CT
NN.7
→
OO.7
Partial sums of geometric series 9JU
NN.8
→
OO.8
Partial sums: mixed review SKG
NN.9
→
OO.9
Convergent and divergent geometric series DY8
NN.10
→
OO.10
Find the value of an infinite geometric series ZVH
NN.11
→
OO.11
Write a repeating decimal as a fraction BPU
OO.1
→
PP.1
Calculate probabilities of events QRS
OO.2
→
PP.2
Counting principle ZUV
OO.3
→
PP.3
Combinations and permutations UAB
OO.4
→
PP.4
Find probabilities using combinations and permutations SVX
OO.5
→
PP.5
Find probabilities using two-way frequency tables HGA
OO.6
→
PP.6
Identify independent events RTZ
OO.7
→
PP.7
Probability of independent and dependent events X5U
OO.8
→
PP.8
Find conditional probabilities 2M4
OO.9
→
PP.9
Independence and conditional probability AJC
OO.10
→
PP.10
Find conditional probabilities using two-way frequency tables HGC
PP.11
Determine independence using conditional probabilities given two way frequency tables KG7
OO.11
→
PP.12
Find probabilities using the addition rule B9L
PP.1
→
QQ.1
Identify probability distributions 9QC
PP.2
→
QQ.2
Identify discrete and continuous random variables ETC
PP.3
→
QQ.3
Write a discrete probability distribution RH6
PP.4
→
QQ.4
Graph a discrete probability distribution 5KH
PP.5
→
QQ.5
Expected values of random variables 3K9
PP.6
→
QQ.6
Variance of random variables KC5
PP.7
→
QQ.7
Standard deviation of random variables SSU
PP.8
→
QQ.8
Write the probability distribution for a game of chance UFQ
PP.9
→
QQ.9
Expected values for a game of chance F2J
PP.10
→
QQ.10
Choose the better bet 5YW
QQ.1
→
RR.1
Find probabilities using the binomial distribution ZGX
QQ.2
→
RR.2
Find probabilities using the normal distribution I QA9
QQ.3
→
RR.3
Find probabilities using the normal distribution II 6M9
QQ.4
→
RR.4
Find z-values PAJ
QQ.5
→
RR.5
Find values of normal variables 9B3
QQ.6
→
RR.6
Distributions of sample means 7YZ
RR.1
→
SS.1
Identify biased samples CH7
RR.2
→
SS.2
Variance and standard deviation
→
Standard deviation of a population V5H
SS.3
Standard deviation of a sample R2Y
RR.3
→
SS.4
Identify an outlier TMV
RR.4
→
SS.5
Identify an outlier and describe the effect of removing it NRJ
RR.5
→
SS.6
Find confidence intervals for population means JVK
RR.6
→
SS.7
Find confidence intervals for population proportions QAD
RR.7
→
SS.8
Interpret confidence intervals for population means MNM
RR.8
→
SS.9
Experiment design BKR
RR.9
→
SS.10
Analyze the results of an experiment using simulations RLB
SS.1
→
TT.1
Outliers in scatter plots XYX
SS.2
→
TT.2
Match correlation coefficients to scatter plots AFK
SS.3
→
TT.3
Calculate correlation coefficients HTW
SS.4
→
TT.4
Find the equation of a regression line D9Y
SS.5
→
TT.5
Interpret regression lines UWX
SS.6
→
TT.6
Analyze a regression line of a data set 6CM
SS.7
→
TT.7
Exponential regression 7TJ
TT.1
→
UU.1
Matrix vocabulary ST5
TT.2
→
UU.2
Matrix operation rules XCW
TT.3
→
UU.3
Add and subtract matrices QFX
TT.4
→
UU.4
Multiply a matrix by a scalar 72T
TT.5
→
UU.5
Add and subtract scalar multiples of matrices XFV
TT.6
→
UU.6
Multiply two matrices T64
UU.7
Add, subtract, and multiply matrices 38N
TT.7
→
UU.8
Simplify matrix expressions GCE
TT.8
→
UU.9
Properties of matrices RA5
TT.9
→
UU.10
Solve matrix equations QU8
TT.10
→
UU.11
Determinant of a matrix KLQ
TT.11
→
UU.12
Is a matrix invertible? M8R
TT.12
→
UU.13
Inverse of a matrix ZAA
TT.13
→
UU.14
Identify inverse matrices VB6
TT.14
→
UU.15
Solve matrix equations using inverses Y6B
TT.15
→
UU.16
Identify transformation matrices 7P5
TT.16
→
UU.17
Transformation matrices: write the vertex matrix CGD
TT.17
→
UU.18
Transformation matrices: graph the image UHM
TT.18
→
UU.19
Solve a system of equations using augmented matrices RCS
TT.19
→
UU.20
Solve a system of equations using augmented matrices: word problems QX5
P.4
→
Solve a nonlinear system of equations
→
Solve systems of linear and quadratic equations GCC
MM.3
→
Evaluate explicit formulas for sequences NV5