What is the definition where of additive inverse?

What is the value of k in the following question: x^2 + kx + 9 = 0

Chris sells encyclopedias and earns $45 for each set he sells. How many sets did he sell if he earned $540 last week?

Today the coast of a gallon of gas is $2.65. Every week for the next 10 weeks, it will increase by $0.05. a gallon. If you wrote a linear equation to model this situation, what would the slope be?

How do you solve this?! What does (w) equal? -1/2w-3/5=1/5w

If 5a+4b=25 and 3a-8b=41, solve for a And b

Circle O has a circumference of 44 what is the length of the diameter

A number is multiplied by 3. If 3 is subtracted from the product you get 24.

Convert 45 miles per hour to feet per hour. Round your answer to the nearest hundredth, if necessary.

You are a driver of a dump truck with a trailer (dump bin) that is 21 feet long, 8 feet wide, and 6 feet tall Daily, you haul full loads of dirt from one location to another. The dump bin can hold dirt equivalent to 1.

What is 6/10 simplified