Ihave 3 equations 9x+6, 2(5x-3) and 5y+14 how do i solve for x?

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.

If f(x) = -5x + 1 and g(x) = x3, what is (gºf)(0)? enter the correct answer