Robert earned $10, which was 4 less than twice what Eric earned , How much money did Eric earn?

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Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

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