During a 4-month-long drought, the water level in a lake changed by 3 1/2 feet. the water level changed at the same rate each month.

what is amount the water level changed in 1 month?
simplify the fraction

The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Can someone me and plz do the problem