The speed of a river current is 2 mph. If a boat travels 30 miles downstream in the same time that it takes to travel 20 miles upstream, find the speed of the boat in still water. The speed of the boat in still water is blank mph.

Find 4x - y - 2z if x = - 2, y = 3, and z = - 2

A typical stone on the lowest level of the great pyramid in Egypt was a rectangular prism 5 feet long by 5 feet high by 6 feet deep and weighed 15 tons what was the volume of the average stone how much did one cubic foot of this stone weigh

What is the percentage of 2/3

What is the true solution to 3 l n 2 + l n 8 = 2 l n (4 x)

10. The convention center has 18 pianos. Each piano has 88 piano keys. What is the total number of piano keys?

Use the matrix method to solve: x + 4y8 2x+y 9

Harley is loading 625 bagsof cement onto small pallets. Each pallet holds 5 bags. How many pallets will harley need?

Simplify the expression. (2x5) 4 2x20 16x20 16x9 2x625

43/14 as a decimal rounded to nearest tenth

Evaluate the summation of 25 times 0.3 to the n plus 1 power, from n equals 2 to 10.