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vaieri [72.5K]
3 years ago
6

What is the sum of the first 7 terms of the series −4+8−16+32−... ?

Mathematics
1 answer:
blondinia [14]3 years ago
4 0

The terms appear to increase by a multiple of -2. The first 7 terms are:

-4 + 8 + -16 + 32 + -64 + 128 + -256. Add these together.

The sum of these numbers is -172.

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Mr. Deveney bought 4 DVDs for $25.20. What was the price per DVD?
ollegr [7]

Answer:

$6.30 per DVD

Step-by-step explanation:

25.20/4= 6.3

7 0
2 years ago
Angelo, Brandon, and Carl work in the same office. Angelo’s age is 4 years more than twice Carl’s age. Brandon is 5 years younge
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Angelo is 66 Brandon is 26 Carl is 31

Step-by-step explanation:

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3 years ago
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People get energy from the food they eat. This energy is measured in calories. When you exercise, you use up or burn calories. T
seropon [69]

Answer:

360

Step-by-step explanation:

There are 60 minutes in 1 hour, so 2 hours = 120 minutes.

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3 0
3 years ago
In ΔLMN, n = 510 cm, l = 820 cm and ∠M=20°. Find ∠L, to the nearest degree
Dafna11 [192]

The angular measure L is : 47°

<h3>What are angles?</h3>

Angles are formed when two lines meet.

Analysis:

Firstly, we calculate for m using cosine rule.

m^{2} = 510^{2} + 820^{2} -2(510)(820) cos 20

m^{2} = 260100 + 672400 -83600(0.9396)

m^{2} = 146618.56

m = \sqrt{146618.56} = 382.9cm

using sine rule to find ∠L

382.9/sin20 = 820/sinL

sinL = 820sin20/382.9

sinL = 820(0.342)/382.9

sinL = 0.732

L = sin inverse of 0.732 = 47°

In conclusion, ∠L is 47°

Learn more about sine and cosine rule: brainly.com/question/4372174

#SPJ1

8 0
2 years ago
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