Choose the answer based on the most efficient method as presented in the lesson. If the first step in the solution of the equation -9 + x = 5x - 7 is "subtract x," then what should the next step be?

add 7
add 9
subtract 5x
p. s. whoever answer thanks so much I appreciate it

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.