12 is what percent of 40

a pulley 18 inches in diameter is driven by a belt at the rate of 90 revolutions per minute. what is the angular velocity of the pulley in radians per minute? what is the speed of the belt in feet per second?

Let tan x = 2.4, sin y = 0.6, and both x and y be between 0° and 90°. Then cos (x + y) equals?

Which two linear equations represent perpendicular lines? select two choices?

If Janet buys a bag for $45.50 and the tax is 5% and she has $60, will she have enough money to buy a $12 movie ticket?

For each function, y varies directly with x. Find each constant variation. Then find the value of y when x = - 0.3. 1. y=2 when x = - 1/2 2. y = 2/3 when x = 0.2 3. y=7 when x = 2 4. y=4 when x = - 3

Julie covered her floor with carpet squares that were each 1 foot on a side. She used 120 carpet squares. what is the area of the floor?

Carmen plays a CD with music from 2 different composers: 2 tracks are Brahms and 4 tracks are Choplin. If her stereo randomly chooses the order in which tracks are played, what are the chances that first music she hears will be Brahms?

A construction worker is placing rivets in a new bridge. He uses 42 rivets to build the first 2 feet of the bridge. If the bridge is to be 2200 feet in length, predict the number of rivets that will be needed for the entire bridge.

12 divided by 1/9 equals

Hideki is collecting pennies. Each month in may, june, and july he put 200 pennies in a jug. He put 300 pennies in th jug in August and 300 in September. How many pennies did Hideki put in the jug between May and September?