Find the exact circumference of a circle with the given radius 7 feet

The triangles are similar. what is the value of x? enter your answer in the box. x = two right triangles. the larger right triangle is labeled x on the longer leg, 12 on the shorter leg and 20 on the hypotenuse. the smaller triangle is labeled 4 on the longer leg, 3 on the shorter leg, and 5 on the hypotenuse.

What is the size of the matrix resulting from

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11