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2 years ago

Find the sum of all integers 30 to 80. (Is there a formula to do this?

Mathematics

2 answers:

Shkiper50 [21]2 years ago

7 0

Answer:

Add all the numbers from 30 to 80 and that is your answer

Step-by-step explanation:

Brums [2.3K]2 years ago

5 0

you consider the arithmetic series with first term 30, common difference 1, and last term 80

the sum of arithmetic sequence is n/2(first term + last term), and there are (80-30)+1 = 51 numbers so n = 51 and so 51/2(30+80) = 2805 which represents the sum 30 + 31 + 31 + ... + 78 + 79 + 80

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The question is in the picture.

ruslelena [56]

Answer:

-8

Step-by-step explanation:

First, plug in the numbers to the equation:

$-4(-1)^{0} 2$

Any non-zero expression raised to the power of 0 equals 1:

$(-4)(1)(2)$

Multiply the numbers:

-8

Hope this helped!

7 0

2 years ago

A publisher requires 2⁄3 of a page of advertisements for every 5 pages in a magazine. If a magazine has 98 pages, to the nearest

rjkz [21]

Let x be the number of pages of advertisements.

Write a proportion from the table:

$\dfrac{2}{3}$ of a page of advertisment - 5 pages in a magazine

x pages of advertisment - 98 pages in a magazine,

then

$\dfrac{\dfrac{2}{3}}{x}=\dfrac{5}{98}.$

Find x:

$x=\dfrac{\dfrac{2}{3}\cdot 98}{5}=\dfrac{196}{15}=13\dfrac{1}{13}.$

Answer: 13 whole pages and $\dfrac{1}{13}$ of 14th page are advertisments, so 14 pages contain advertisments.

3 0

2 years ago

!!!Factor each completely, please

frez [133]

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3. 3 (2x +7)

4. 79x - 3

5. 4 (24x -1)

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5 0

2 years ago

(2) (x-7) (=3) (x+8)

Tasya [4]

Use the distributive property to get 2x - 14 = 3x + 24. Subtract 24 from both sides to get 2x - 38 = 3x. Subtract 2x from both sides to get -38 = x.

7 0

2 years ago

Read 2 more answers

Leyla drops a penny from a height of 150 m. How long will it take the penny to hit the ground? Use the formula h(t)=−4.9t^2+vt+h

torisob [31]

To determine the time it takes for the penny to reach the ground, we use the relation of height and time given above. We do as follows:
<span>
0 =−4.9t^2+(0)t+150
t = sqrt( 150/4.9)
t = 5.53 s

Hope this answers the question. Have a nice day.</span>

4 0

2 years ago

Read 2 more answers