Solve the equation for the variable. show each step of your solution process.
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In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles.

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi