How do you solve this system of equations?

18x^2+12xy-18y^2=30

-x^2-3xy+y^2=3

4. The space shuttle travels at about 28,000 km per hour. Using that information, estimate how many hours it will take the shuttle to reach Saturn from Earth. (Assume both planets are aligned with the sun and are on the same side of the sun.

Is it one solution, no solution, infinitely many solution also show for work 3 (x + 5) - 10 = 3x + 2

How do you convert14/16 to a percent?

Jamal was riding his bike home at a speed of 12 mph. On his trip out, he had traveled 8 miles away from his house. He has been traveling for a half hour at this speed. How far away is from his home?

A nutritionist claims that the mean tuna consumption by a person is 3.5 pounds per year. A sample of 70 people shows that the mean tuna consumption by a person is 3.3 pounds per year. Assume the population standard deviation is 1.22 pounds.

An air conditioning fan makes 125 revolutions per second, how many revolutions will it make if it runs for 30 minutes?

If 1+9+8=1 then 2+8+9=x

How many pounds ante in 60 kilograms

Is the expression 4 (3 + 5) - 10 = 4 x 3 + 5 - 10 true or false? Explain

3x+2 (5x-3) = 7 multi step equation