(The sum of 5 times a number and 6 equals 9) Translate the sentence into an equation

use the variable c for the unknown number

does anyone know the answer to this ?

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.