I have been struggling on this problem for a while: Let triangle ABC be a right triangle, and let point H be the point on side AB so that line CH is perpendicular to line AB. Prove that (x + h)^2 + (y + h)^2 = (a + b)^2. Any help will be greatly appreciated! Thank you!

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Suppose i pick a jelly bean at random from a box containing one red and eleven blue ones. i record the color and put the jelly bean back in the box. if i do this three times, what is the probability of getting a blue jelly bean each time? (round your answer to three decimal places.)

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form