3 years ago

Use the formula to evaluate the series 3-9+27-81+...-ae

Mathematics

1 answer:

Anastasy [175]3 years ago

7 0

Answer:

( -4920)

Step-by-step explanation:

we see that the first term is 3 and the common ratio between the succeeding terms is -3. so to solve for the sum of the first 8 terms

Sum = (a1)(1 – r^n) / (1 – r)

and substituting the known terms,we got

Sum = (3)(1 – (-3)^8)/(1 - (-3)) = -4920

Then the answer = ( -4920)

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Raj weighs a book and rounds the weights to the nearest tenth. Does this weight round to 1.5 pounds?

mel-nik [20]

Step 1: Locate and underline the tenth place (4) and look to the right (8)

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Step 2: In this case, the digit to the right 8 is 5 or above. So, we add 1 to the tenth place 4. The digit at the right 8 becomes 0, thus we get 1.5 as the answer.

In short: 1.48 rounded to the nearest tenth is 1.5.

Hope that helped

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Answer:

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3 years ago

Simplify 5x + 3y - 2x

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2 years ago

What is the GCF of 18 and 130? 2, 3, 5, 8, 13,

grandymaker [24]

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Could 1.5, 2.5, 3.5 and 6, 10, 12 be the corresponding sides of two similar triangles

boyakko [2]

Answer:

Step-by-step explanation:

If the ratios of the corresponding sides are equal then they would be the sides of 2 similar triangles.

Calculate the ratio of corresponding sides.

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Thus the sides are not the corresponding sides of similar triangles.

4 0

2 years ago