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Marrrta [24]
3 years ago
7

How do you estimate21× 78

Mathematics
1 answer:
finlep [7]3 years ago
8 0

21 *78=

20 * 80=

1600 as an estimate


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Step-by-step explanation:

Use SOH-CAH-TOA.

Sine = Opposite / Hypotenuse

Cosine = Adjacent / Hypotenuse

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