The square of a number decreased by 15 is equal to twice the number. find the number

There are a total of 75 students in the robotics club and the science club. the science club has 11 more students than the robotics club. how many students are in the science club?

The length of a rectangle (x+5) inches long, and the width is 3 2/5 inches. if the area is 51 square inches, write and solve an equation to find the length of the rectangle.

The unemployment rate in a city is 13%. if 6 people from the city are sampled at random, find the probability that at least 3 of them are unemployed. carry your intermediate computations to at least four decimal places, and round your answer to two decimal places. (if necessary, consult a list of formulas.)