Evaluating Expressions - Math 7

Evaluating Expressions - Math 7

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Evaluate      $z+7$   when  $z=9$  

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Evaluate $d-12$  when  $d=-11$  

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Evaluate $-7y$  when  $y=-5$  

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 $5x-4\ for\ x=-3$  

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 $\frac{a}{-3}+a\ for\ a=-9$  

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 $4x^2+3x,\ for\ x=3$  

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 $a^2+b-12\ when\ a=-5\ and\ b\ =-2$  

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 $\frac{3}{n}+2m,\ for\ n=-3\ and\ m=4$  

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The expression 60m gives the number of seconds in m minutes. Evaluate 60m for m = 7. How many seconds are there in 7 minutes? E

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Alvin has x quarters. You can use the expression 0.25x to find the total value of his coins. What is the value of 18 quarters? Enter just the number.