Systems of equations?

X-2y=-8

6x+7y=9

Solve

A submarine cruised below the surface of the water. During training exercise, it made 4 dives, each time descending 45 feet more. Then it rose 112 feet. What is the change in the submarine's position?

Find the distance between the given number and it's opposite on a number line? 6

What is - 20:45-20:45? A. - 25 B. - 16 C - 1/16 D. - 1/25

Earth spins on its axis once every 23.934 hours. What is this time rounded to the nearest hundredth?

You flip a coin twice. The first flip lands tails-up and the second flip also lands tails-up.

Jason buys sports equipment worth $80.00 and pays 5% sales tax. What is the total amount Jason pays including sales tax, for sports equipment?

I have an account balance of $200. I used my debit card to make a purchase of $350.25 how much money is in my account

Jason entered the elevator of the skyscraper on the ground floor and rode up to the 45th floor. Since Jason was texting, he didn't notice where he was, so he then rode down 28 floors and finally up 15 floors where he exited the elevator.

Randall bought a bond with a face value of $6000 and a coupon rate of 7.25%. the bond will mature in 5 years. how much interest will he receive semiannually?

Ryan has $0.75 worth of pennies and nickels. He has 3 more nickels than pennies. Determine the number of pennies and the number of nickels that Ryan has.