How many gallons of a 20% salt solution must be mixed with 4 gallons of a 30% salt solution to make a 25% salt solution?

2p + 8 = - 2p what is p

Kelsey had $65 to spend on books. Each book cost $5.50, and there was a $7.50 fee for shipping. She let b equal the number of books she can purchase and wrote the inequality 5.5b+7.5<65 to represent the situation.

What's the answer for y=3x+7

The amount of money that Li spends on video games depends on how many games he purchases. If Li has at most $90 to spend on games for his Xbox 360 and the games cost $22.50 each, what is the domain of this function?

An equilateral triangle has side lengths that measure x+4 inches. The perimeter of the triangle is 18.6 inches. Write an equation to find the value of x.

The time to failure (in hours) for a laser in a cytometry machine is modeled by an exponential distribution with. Round the answers to 3 decimal places.

Find comp f (x) = 2x + 3 g (x) = x2 - 3x + 1 Write g (f (x)) as an expression in terms of x.

You travel 40mph in a car and then travel 70mph in a train. If the total trip takes 13 hours and you travel 760 miles how far did you travel in each method

The sixth grade is raising money for the local animal shelter. So far they have raised $320, which is 40% of their goal. How much money do they hope to raise?

About how many feet does a team of athletes run in 1600 m relay race