What is 0.4 four by the power of ten three times??

Sum is 17 and their difference is 3

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.