5/6r=15 what is the value of r

If f (x) varies directly with x2, and f (x) = 40 when x = 2, find the value of f (5).

A system of equations consists of two lines. line one passes through (-1,3) and (0,1). the other line passes through (1,4) and (0,2). determine if the pair has no solution, one solution, or an infinite number of solutions.

Part c when sizes of pizzas are quoted in inches, the number quoted is the diameter of the pizza. a restaurant advertises an 8-inch "personal pizza.

Percent change in 66 to 30 toy fed to nearest percent.

Andrea is a very good student. The probability that she studies and passes her mathematics test 17/20. If the probability that Andrea studies is 15/16, find the probability that Andrea passes her mathematics test, given that she has studied.

Jims fish bowl contains x tetras, 3 goldfish, and 5 platies. He removes one fish from the fish bowl at random. If the probability of removing a gold fish from the bowl is 1 out of 3, how many tetras does jim have.

The amount Troy charges to mow a lawn is proportional to the time it takes him to mow the lawn. Troy charges $30 to mow a lawn that took him 1.5 hours to mow.

Consider (2x-1) + 2>x+1. Use the addition or subtraction property of inequality to solve for x.

19/3 (write the improper fraction as a mixed or whole number.)

Randy wants trail mix for his hiking trip. The ready-made trail mix costs $8.95 for 1.5 pounds. The costs of the bulk ingredients to make one pound of trail mix are as follows: salted peanuts-$1.25, raisins-$1.70, sunflower seeds-$0.50, cashews-$0.