mel paid for 3/4 of the cost of a cake and Gretchen paid the rest. If Mel paid $21, how much did Gretchen pay?​

Find the given elements if matrix d:

5× 1/2 = ? a) more than 5 because you are multiplying by a whole number b) 5/10 because you multiply the numerator and denominator by 5 c) less than 5 because you are multiplying by a number that is more than 1 d) less than 5 because you are multiplying by a number that is less than 1

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day