Can you use addition or subtraction to solve any system

Choose a number with 2434 > your number > 19

I don't know how to solve questions like this. k-10=-7

Arjun sent 4 pieces of mail in December, 5 pieces of mail in January, 8 pieces of mail in February, and 13 pieces of mail in March. If this pattern continues, how many pieces of mail will Arjun send in April?

Isabel deposits$6000 into an account that earns1.5% interest compounded monthly. assuming no more deposits and no withdrawals are made, how much money is in the account after 4 years?

Why is the product of 8*8 called a square number

What is the value of 13 tens

There is a geometric theorem that says if two lines are perpendicular to the same line, they are parallel to each other explain why this is true by writing & comparing equations

How do you graph (y=-1/2x-1) (y=-3x+4)

A motorboat travels 448 kilometers in 8 hours going upstream and 516 kilometers in 6 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?

Jack made 50% more smoothies than yesterday. If he made 30 smoothie today how many did he make yesterday?