Find the area of a semi-circle with radius, r = 2cm.

Give your answer as an expression in terms of π.

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