A riverboat can head 340 miles upriver in 19 hours, but the return trip takes only 14 hours. Find the current of the river and find the speed of the riverboat in still water

Justin is 3 years older then sam, and justin's age in 2 years will be twice what sam's age was 3 years ago. find their present ages.

What is x=y-5 in standard form

x + y + z = 2, x + 3y + 3z = 2 (a) Find parametric equations for the line of intersection of the planes. (Use the parameter t.) (x (t), y (t), z (t)) = (b) Find the angle between the planes. (Round your answer to one decimal place.)

This stainless-steel fitting measures 3.9 cm long. It has an inner diameter of 2.7 cm and an outer diameter of 3.6 cm. If the density of stainless-steel is 8 g/cm3, what is the mass of the fitting?

If a needle is 3.5 cm long, how many millimeters is that?

In the dryer there are 18 red socks, 24 white socks, 8 blue socks, and 10 black socks. Fred wants to have two matching socks to wear. He reaches into the dryer and without looking pulls out one sock at a time.

State whether each question below represents a proportional relationship. How can you tell? a. y = x + 2.3 b. y=6/13x c. 7-y=2x

Given that v = 5,-4,4) and w = 10,-27), evaluate you a 81 C. (45,8,28) b. 19 d - 40-16-8)

A target has 4 rings on it. How many different ways could two arrows be distributed on it.

How do you solve ... 3c^3d/9cd^-1