A jeweler has five rings, each weighing 18g, made of 20% silver and 80% gold. He decides to melt down the rings and add enough silver to reduce the gold content to 60%. How much silver should he add?

What is the factored form of 5x^4+15x^3-10x^2

Find expressions for the partial derivatives of the following functions: a. f (x, y) = f (g (x) k (y), g (x) + h (y) b. f (x, y, z) = f (g ( + y), h (y + z)) c. f (x, y, z) = f (xy, yz, zx) d. f (x, y) = f (x, g (x), h (x, y))

In city A, the mean commute to work is 17 miles with a range of 12 miles to 19 miles. In city B, the mean commute to work is 22 miles with a range of 19 miles to 24 miles.

There are 80 students in a speech contest. Yesterday, 1/4 of them gave their speeches. Today, 1/5 of the remaining students gave their speeches. How many students still haven't given their speeches?

Which polynomial is a quintic binomial? A) 5x2-2x+1 B) x2+4x C) x4+2x3-x2+7x+11 D) 3x5+2

Find an equation of the line that satisfies the given conditions. Through (-1, - 2); perpendicular to the line 2x + 7y + 8 = 0

The difference of two numbers is more than 12, and one of the numbers is 3.

What is a spiral review of 14-6

How many quarts equal to 8 gallons

Solve for d. 5+d>5-d d>-10 d<-5 d>0 d>6