AHH PLS HELP What are the X and Y intercepts for a line with the standard form equation of 3X + 7Y = 21

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?

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Measure of angles 31 (x+4) (3x+9) me