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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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2 years ago

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timurjin [86]

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2 years ago

NEED THIS TO BE CORRECT, I WILL GIVE ANYTHING!!

dolphi86 [110]

Step-by-step explanation:

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3 years ago

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A rotating light is located 20 feet from a wall. The light completes one rotation every 3 seconds. Find the rate at which the li

ss7ja [257]

Answer:

43.17 ft/s

Step-by-step explanation:

Let the height of the wall is y.

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$tan\theta =\frac{y}{20}$

y = 20 tanθ .... (1)

time period, T = 3 second

$\frac{d\theta}{dt}=\frac{2\pi}{3}$

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3 years ago