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barxatty [35]
3 years ago
13

Find the sum of an 8-term geometric sequence when the first term is 7 and the last term is 114,688 and select the correct answer

below.
Mathematics
2 answers:
Leya [2.2K]3 years ago
7 0
It is multiplied by 4 each time.
VARVARA [1.3K]3 years ago
3 0
First term a1 = 7
8th term a1*r^7 = 114688

so r^7  =   114688/7 = 16384

r = 16384 ^ (1/7)  = 4

S8  = a1 * (r^n - 1 )/ (r - 1)   = 7 * (4^8 - 1) /  3  =   152,915  answer
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A cube has a volume of 2197 m^3. Its surface is to be painted. Each can of paint covers about 40 m^2. How many cans of paint are
Gelneren [198K]
<em>Volume= a³</em>
<em>a=edge</em>
<em>2197 = a³</em>
<em>=> a=13 m</em>
<em>Surface area=6a²=6*13²=6*169=1014 m²</em>
<em>\frac{1014}{40} = 25,35 ≈ 26</em>
<em>=> <u>26 cans needed</u></em>
8 0
3 years ago
6x+8y=30
weeeeeb [17]
First substitute .5x in for y to get a solvable equation. You should get 6x+8(.5x)=30. Then multiply 8 times .5 to get 6x+4x=30. Then combine like terms (6x+4x) to get 10x=30 and divide both sides by 10 to get x=3. Then plug this x value (3) into the other equation (y=.5x) to find the value of y. Y=.5(3) so y=1.5. Therefore the answer is B.

8 0
3 years ago
Which statement is true about the difference 2 square root of 7 − square root of 26?
lora16 [44]

2√7 - √26 ≈ 5.29150262213... - 5.09901951359...

... ≈ 0.19248310854...

The result is an irrational number not described by any of your answer selections.

None of the statements is true.

7 0
3 years ago
What is the solution to 10y=5x+10
mixas84 [53]
 The slope intercept form of that equation would be y = 1/2x + 1. 1 would be the y-intercept, and 1/2 would be the slope. If you are looking for the answers to y and x, you would need another equation containing those variables to figure that out.
3 0
3 years ago
What is the square root of 539?
Mama L [17]
You would use 539 and square it on you cal. just once. Then once you do that the answer is not going to be a whole number it is going to have a decimal, so the answer would be 23.22. 
6 0
3 years ago
Read 2 more answers
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