How to do certain word problems

This year, David watch 30 movies. He thought that 21 of them were very good. Of the movies he watched, what percentage did he think we're very good?

A dog eats 5 cups of food a day. a pound of food contains 10.5 cups. how much does it cost to feed the dog each day if a 50 lb bag costs $22.50?

Solve for x. 4 - (2x+4) = 5 x=-10 x=6 x=-52 x=32

What is 3/18 and 12/20 simplified

The sum of the angle measured in a triangle is 180°. Two angle of a triangle measures 20° and 50°. What did is the measure of the third angle

The graph shows how many centimeters above a table top, y, a painted spot on an automated hamster wheel is for a given number of seconds x. How many degrees is the painted spot turning in 0.75 s? Enter your answer in the box.?

Amedeo rental store rented 170 horror 230 drama 120 mystery 310 romance and 150 comedy if a person Celexa movie to rent what is the probability that it will be romance or comedy

The perimeter of a rectangle is 66 m. the length is 1 m more than three times the width. find the dimensions of the rectangle.

What is the value of the missing exponent in the expression below 523 : 10□ = 52.3

2x+3=x+x+3 Show your work