I don't need the answer but can someone explain what this is asking me for?: Find a number such that 16 less than twice the number is 84.

Acamper leaves camp on a kayak and travels 50 miles east on a river, then he ties his kayak to the bank and travels 20 miles north on a bicycle. this trip can be plotted on the coordinate plane, where the camp is the point (0, 0). the distant of the camper to the camp can be found using the distance formula. which other formula can he use? a) 502 - 202 b) 502 + 202 c) 502 - 202 d) 502 + 202

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

Bring the fraction a/a-4 to a denominator of 16-a^2