Q: Evaluate a-2 for a equals 8?

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x=y-8 z=x+12

0.5*8=.40

20.

explain how to evaluate an algebraic expression for given variables. how would we evaluate the expression "3x-4y+9" when x=2and y=5?

-11

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If its 2a=8 then a= 4 If a=8 then a2=16 If 8=D then 8=====================================D

A2 + B2 = C2 If C=8, then A2 + B2 = 64

Evaluate -4(a+b) - 10a/b when a=8 and b=5

a2

To evaluate it you need to know both b and a. But it is possible to factorise it as follows: b2-a2 = (b-a)*(b+a)

x=y-8 z=x+12

8+6x = ? 8+6*5 = ? 8+30 = ?

0.5*8=.40

a=-2 4b=-2 --> b=-1/2 c=8 (-2)(-1/2)(8)(3)= 24

14

900

The answer is 1, whatever the value of a.