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(Unlimited Practice) SAT Math: Common Math Tricks

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What is the value of $c+d$ if $c^2-d^2$ is $-11$ and $c-d$ is $-11$ ?

2

3

-1

1

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If $2a + 3b = 20$ and $5a+4b = 36$ , what is the value of $a+b$ ?

11

8

7

10

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If $3c + 4d = 11$ and $3c+2d = 7$ , what is the value of $4c+4d$ ?

14

15

13

12

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What is the value of $c+d$ if $c^2-d^2$ is $91$ and $c-d$ is $7$ ?

13

12

11

16

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What is the average of $c$ and $d$ if $c^2-d^2$ is $-24$ and $c-d$ is $-12$ ?

3

0

2.5

1

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If $2x + 2y = 10$ and $5x+5y = 25$ , what is the value of $2x+2y$ ?

12

13

10

9

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