Respuesta :

we have

5 x 4 1/5

remember that

4 1/5=4+1/5=21/5

so

substitute

5x 21/5=21 ------> exact value

An estimate of the product will be

5 x 4 1/5=5 X 4=20

because round 4 1/5 to the nearest whole number

4 1/5=4

therefore

the answer is 20 option C

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