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Basic Math
Arithmetic
Fractions & Decimals
Ratios & Proportions
Percentages
Basic Number Theory
Pre-Algebra
Integers & Absolute Values
Factors & Multiples
Prime Factorization
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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
$$(-9)-(9)+(20)$$
Evaluate
$2$
Solution Steps
Subtract $9$ from $-9$ to get $-18$.
$$-18+20$$
Add $-18$ and $20$ to get $2$.
$$2$$
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Factor
$2$
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