exam Maths Puzzle Numerical Ability

Can I have some help with a study guide question?

A large solar hearing panel requires 120 gallons of a fluid that is 30% antifreeze. The fluid comes in either a 50% solution or

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exam Other Question

14. An oblique triangle has A=68 degrees, B= 79 degrees, and b= 8.0 ft. Determine the length of side c. To whom may it concern,

I have this tricky question to solve.

If x + 2y = -2 and x - 2y = 18, find the value of x^2 + 4y^2.

According to my teacher, the answer is 164 but how ?

Please help. Thanks.

CH Lam