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sertanlavr [38]
2 years ago
11

How can you use estimation to find 92 +91 +92 +91 +9?

Mathematics
2 answers:
Over [174]2 years ago
5 0

Answer:

370

Step-by-step explanation:

Round each answer into easier to add numbers. 92 and 91 round down to 90. 9 rounds up to 10.

Darina [25.2K]2 years ago
4 0

Answer:

aprox 280

Step-by-step explanation:

if you need to add these numbers quickly you can estimate either with an overestimation or under estimation:

for an over estimation, you can find the nearest 10 or 100 that each value is so for this you have 92 + 91 +92 +9 which is close to 100 +100+100+10

so using this you can quickly guess that it would be somewhere around 310

for an under estimation you can do the same thing but rounding down so we instead would add 90 + 90 + 90 + 10 which gives 280

now using both we know the answer would be somewhere between 280 and 310

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Find the sum of the first 40 terms of a geometric sequence where the first term is 16 and the common ratio is 1.1. 704 7,081.480
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Step-by-step explanation:

The nth term of a geometric progression can be determined by using the formula:

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Substitute the given values of first term and common ratio into the formula:

Tn=arn−1

T5=(40)(0.5)5−1

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8 0
3 years ago
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Llana [10]

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3 years ago
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Answer:

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