Two airplanes leave the same airport. One plane heads south while the other plane heads west. After some time, the southbound plane has traveled 52 miles. If the two planes are 103 miles apart, how far has the westbound plane traveled? Round your answer to the nearest mile.

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?