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(Unlimited Practice) SAT Math: Common Math Tricks

 
What is the value of (r + t)^2 if r^2 + t^2 = 13 and rt = 6?
What is the value of y+z if y^2-z^2 is -45 and y-z is -9?
What is the value of (a + b)^2 if a^2 + b^2 = 26 and ab = 5?
What is the value of a+b if a^2-b^2 is -3 and a-b is -3?
If 2c + 2d = 10 and 5c+5d = 25, what is the value of c+d?
If 4c + 3d = 10 and 2c+3d = 8, what is the value of c+d?

 

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