Aradio telescope has a parabolic dish. radio signals are collected at the focal point (focus) of the parabola. the distance from the vertex of the parabolic dish to the focus is 20 feet. the vertex of the dish is located at a point 30 feet above the ground and 80 feet to the east of a computer that reads and records data from the telescope. the diameter of the dish is 120 feet.
what is the depth of the parabolic dish?

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section