Evaluate
-21.4
Factor
-21.4
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15+4.2\times 13-7\times 13
Multiply 7 and 0.6 to get 4.2.
15+54.6-7\times 13
Multiply 4.2 and 13 to get 54.6.
69.6-7\times 13
Add 15 and 54.6 to get 69.6.
69.6-91
Multiply 7 and 13 to get 91.
-21.4
Subtract 91 from 69.6 to get -21.4.
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