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Basic Math
Arithmetic
Fractions & Decimals
Ratios & Proportions
Percentages
Basic Number Theory
Pre-Algebra
Integers & Absolute Values
Factors & Multiples
Prime Factorization
Basic Equations & Inequalities
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Algebra
Linear Equations & Inequalities
Quadratic Equations
Polynomials & Factoring
Functions & Graphs
Systems of Equations
Trigonometry
Trigonometric Functions
Trigonometric Identities & Equations
Right Triangle Trigonometry
Unit Circle
Graphing Trigonometric Functions
Calculus
Limits & Continuity
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Example
3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b
Question
$$13-(-8)=$$
Evaluate
$21$
Solution Steps
The opposite of $-8$ is $8$.
$$13+8$$
Add $13$ and $8$ to get $21$.
$$21$$
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Factor
$3\times 7$
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