How to find the value of x?

I have four dogs whose average weight is 63 pounds. I also have three cats. The average weight of all seven of my animals is 41 pounds. What is the average weight of my cats?

Factor 9x^2+66xy+121y^2

Are rational numbers always, sometimes or never natural numbers?

As college has ten instructor qualified to teach a special computer lab course that requires two instructors to be present how many different pairs of teachers could there be?

Translate this phrase into an algebraic expression. 66 less than twice Victor's age Use the variable V to represent Victor's age.

What is the variance of the values 8,10,14,12?

Simplify the expression. 3 (x 3) - 2x 4

Suppose that $2000 is loaned at a rate of 15.5%, compounded semiannually. Assuming that no payments are made, find the amount owed after 9 years. Do not round any intermediate computations, and round your answer to the nearest cent

Sam bought 2 3/4 pounds of shrimp and 2 1/2 pounds of crabmeat. How much seafood did he buy?

Gerald is an electrician. He charges a callout fee of $100 and charges $80/hr. Represent the cost of hiring Gerald for h hours using an algebraic expression.