A mountain climber started at sea level and descended down a cliff Her location can be represented by -75 feet. How many feet did the mountain climber descend?
11

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?

Which strategy is used by public health to reduce the incidence of food poisoning?