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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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Quadratic Equations
Polynomials & Factoring
Functions & Graphs
Systems of Equations
Trigonometry
Trigonometric Functions
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Example
3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b
Question
$$15-(-13)=$$
Evaluate
$28$
Solution Steps
The opposite of $-13$ is $13$.
$$15+13$$
Add $15$ and $13$ to get $28$.
$$28$$
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Factor
$2^{2}\times 7$
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