21x+7y=42 and - 5x+5y=10

Find the solution to the system of equations

Simplify each expression. 2d (3)

The cargo loads that Niels transports in his truck have a mean weight of 42,000 lb with a standard deviation of 1,500 lb. What will be the mean and standard deviation of the distribution of weights in kilograms? 1 lb approximately equals 0.45 kg.

Marcy concludes that the following system of equations has one solution. y = 3x + 6 y = - 2x + 10 Which characteristic of the equations did she use to reach this conclusion? A. They have different slopes. B. They have the same two variables. C.

Sam buys tickets to a basketball game for $92.00 total. He must also pay 11% sales tax on the tickets. Write and simply a numerical expression that represents the total cost.

If a fuel efficient car can go 210 miles on 4 gallons of fuel, how far can it go on 12 gallons?

Noah has 6 and 1/4 cups of flour to use for pizza. Each pizza crust takes 1/4 cups of flour. How many pizzas will Noah be able to make?

A rectangle is 3 times as long as it is wide. The perimeter is 60 cm. Find the dimensions of the rectangle. Round to the nearest tenth if necessary.

An auditorium has 25 rows with 45 seats in each row. How manry seats are there in all?

Rewrite this expression with grouping symbols: 5m + 5n

If a triangle has angles that fit the ratio 4:3:2, what would be the measure of each of the angles?