Tell whether the ratios form a proportion
3/7, 12/21

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.

Listed in the table is the percentage of students who chose each kind of juice at lunchtime. use the table to determine the measure of the central angle you would draw to represent orange juice in a circle graph

Asystem of equations has 1 solution. if 4x-y=5 is one of the equations , which could be the other equation ?