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Evaluate One Variable Expressions>
Evaluate One Variable ExpressionsEvaluate One Variable Expressions
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Question 1 of 5
1. Question
Given that `a=8`, evaluate the expression`a+7`- (15)
Hint
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Simply substitute the given value for the variable.`a` `=` `8` `a` `+7` `=` `8` `+7` `=` `15` `15` -
Question 2 of 5
2. Question
Given that `a=7`, evaluate the expression`2a-11`- (3)
Hint
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Excellent!
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Simply substitute the given value for the variable.`a` `=` `7` `2``a` `-11` `=` `(2xx``7` `)-11` `=` `14-11` `2xx7=14` `=` `3` `3` -
Question 3 of 5
3. Question
Given that `a=8`, evaluate the expression`40-3a`- (16)
Hint
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Keep Going!
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Simply substitute the given value for the variable.`a` `=` `8` `40-3``a` `=` `40-(3xx``8``)` `=` `40-24` `3xx8=24` `=` `16` `16` -
Question 4 of 5
4. Question
Given that `a=5`, evaluate the expression`2a^2`- (50)
Hint
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Simply substitute the given value for the variable.`a` `=` `5` $$2\color{#9a00c7}{a}^2$$ `=` $$2\times(\color{#9a00c7}{5})^2$$ `=` `2xx25` `5^2=5xx5=25` `=` `50` `50` -
Question 5 of 5
5. Question
Given that `a=6`, evaluate the expression`2(a^2+1)`- (74)
Hint
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Correct!
Incorrect
Order of Operations (PEMDAS)
P`=`Parentheses
E`=`Exponents
M/D`=`Multiplication/Division
A/S`=`Addition/SubtractionSimply substitute the given value for the variable.`a` `=` `6` $$2(\color{#9a00c7}{a}^2+1)$$ `=` $$2(\color{#9a00c7}{6}^2+1)$$ `=` `2(36+1)` `6^2=36` `=` `2xx37` Solve the operation inside the parenthesis `=` `74` `74`
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