Question

10+15+20+25+30+35+...+155=?​

Answer 1

Ответ:

Этот ответ правильно считаешь то ставь луший ответ

Пошаговое объяснение:

10+15=25+20=45+25=80+30=110+35=145+155=300

Answer 2

To find the sum of the arithmetic series from 10 to 155 with a common difference of 5, you can use the arithmetic series formula:

Sum = (n/2) * [2a + (n - 1)d]

Where:

• n is the number of terms.
• a is the first term.
• d is the common difference.

In this case, a = 10, d = 5, and you want to find the sum up to 155, which is the last term. To find n, you can use the formula for the nth term of an arithmetic series:

nth term = a + (n - 1)d

155 = 10 + (n - 1) * 5

Now, solve for n:

155 = 10 + 5n - 5

155 - 10 = 5n

145 = 5n

n = 145 / 5 n = 29

Now that you have the value of n, you can find the sum:

Sum = (n/2) * [2a + (n - 1)d]

Sum = (29/2) * [2 * 10 + (29 - 1) * 5]

Sum = (29/2) * [20 + 28 * 5]

Sum = (29/2) * [20 + 140]

Sum = (29/2) * 160

Sum = 29 * 80

Sum = 2,320

So, the sum of the series 10 + 15 + 20 + 25 + 30 + 35 + ... + 155 is 2,320.