Which observatory detects X-rays and gamma rays?
A. The Hubble Space Telescope
B. The Spitzer Space Telescope
C. The Compton Gamma Ray Observatory
D. The Chandra X-ray Observatory

Zac wanted to determine the measure of r and of ? r in the triangle below. to fine the measure of r, zac sets up the problem.42^2 + 24^2 = r 2. determine whether zac set the problem up correctly.