What quantity of 60 per cent acid solution must be mixed with a 25 per cent solution to produce 420 mL of a 50 per cent solution?

How to use order of operation in 20 divide by 4 multiply 5 = 1

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.