What is the mean of this set of average daily summer temperatures for a seven-day period for a certain city? (I selected A but it may be wrong, thats why im posting it here)

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles. i'm desperate.

F(x)=5/6x+3 which of the following is true

Larry wants to buy some carpeting for his living room. the length of the room is 4 times the width and the total area of the room is 16 square meters. what is the length of the living room