In the chemistry lab an experiment requires 500 mL of one ingredient to be mixed with 1000 mL of another. How many ounces is the solution?

Don't know how to find x given these segment lengths

The square root of 9x plus 7 plus the square rot of 2x equall to 7

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.