What is the solution to the linear system y=-5x-21 and y=7x+15

Find the mass and center of mass of the S solid bounded by the paraboloid z = 6x2 + 6y2 and the plane z = a (a > 0) if S has constant density K. Use cylindrical coordinates.

Jack spends 1 3/4 as long on his homework as jill. last week jill spent 6 1/2 hours on her homework. how long did jack spend doing his homework? the week before jack spent 19 1/2 hours doing his homework. how long did jill spend on doing homework?

The ratio of Isabella's money to Shane is 3:11 If she has $33, how much do they have together?

Three friends each bought two slices of pizza and a drink at the mall. If drinks cost $0.75 and the total of their order was $11.25, how much did one slice cost?

What is 0.07 divided by 2.08?

What's a cube root between 4.2 and 4.2

In the United States, 131313 out of every 202020 cans are recycled. What percent of cans are recycled?

If the village (which includes people and livestock) requires a total of 430 liters of water each day, approximately how long (in days) will one tank provide an adequate supply for the village? give your answer to the nearest 10th of a day.

In the currency pair USD/CAN, CAN is the

Oliva has a job as a writer, she writes 2 new sheets of magazines for her job in 3 hours. What is the rate per hour at she writes the sheets of magazines?