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Basic Math
Arithmetic
Fractions & Decimals
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Percentages
Basic Number Theory
Pre-Algebra
Integers & Absolute Values
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Quadratic Equations
Polynomials & Factoring
Functions & Graphs
Systems of Equations
Trigonometry
Trigonometric Functions
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Graphing 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
$$(-7)-(-20)=$$
Evaluate
$13$
Solution Steps
The opposite of $-20$ is $20$.
$$-7+20$$
Add $-7$ and $20$ to get $13$.
$$13$$
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Factor
$13$
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