One day, the temperature in philadelphia was at 21 degrees and the temperature in detroit was -7 degrees. how much lower was the temperature in detroit than in philadelphia

21-(-7)=28

Step-by-step explanation:

1. Do same, change, opposite.

21-(-7)

21+7

=28

$9.89

step-by-step explanation:

9.90 = p x .06 x .25 (3/12 changed to a decimal)

9.90 = p x 0.015

9.90 - 0.015 = p

9.89 = p

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step-by-step explanation: