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42, because if there is nothing between the 7 and 'a' and 'a' equals 6 then the answer is 42.

Lvl 1

not the correct answer

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Lvl 2

a+4

A+7

Q: Evaluate 7a if a equals 6?

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7a-17 = 4a+1 7a-4a = 1+17 3a = 18 a = 6

3 6

D = 210

7a + 4 = 5a + 7 7a = 5a + 3 2a = 3 a = 3/2

-8

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555

7a + 6 = -36 Subtract 6 from both sides: 7a = -42 Divide both sides by 7: a = -6 a = -6

a + 18 = 7a a-a +18 = 7a-a 18 = 6a 18/6 = 6a/6 3 = a 3=a

The variable is a. You can solve for it, like this: 8a - 9 = 7a - 6 8a = 7a + 3 8a - 7a = 3 a = 3

4a-2=7a-6 4=3a a=4/3

3a + 4a +/- 6; take the 3a & 4a and combine them; 7a +/- 6 would be your answer as 6 cannot combine with 7a due to the variable. If 7a +/- 6 = 0, then subtract/add (respectively) the 6 depending on the operation. Therefore 7a + 6 = 0 turns to 7a = -6. Divide the 7 with the -6 to get the a alone; a = -6/7 or -0.8. Cannot be simplified.

7a-17 = 4a+1 7a-4a = 1+17 3a = 18 a = 6

6

4a

9a-a = 19+7a 8a = 19+7a 8a - 7a = 19 + 7a - 7a 1a = 19 a = 19

Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3

find out what 6 squared equals. which is 6 x 6 and that equals 36