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dlinn [17]
3 years ago
7

Determine the length of side CB. A) 5 B) 5V 5V D) 10

Mathematics
1 answer:
ra1l [238]3 years ago
7 0

Answer:  5\sqrt{3}  which is choice C

=====================================================

Explanation:

This is a 30-60-90 triangle. The short leg is 5, as it's opposite the smallest angle. The long leg is \sqrt{3} times that of the short leg.

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12) Find the sum, S7 for the geometric series {1 + 5 + 25 + - + 15625).
zhenek [66]

<u>Understanding:</u>

The sum of a geometric series is, a+ar+ar^2+ar^3+..., with a being the start point and r is the common ratio. We can also use the following formula to make life easier S_n=a\frac{1-r^n}{1-r}, a is your start point, r is the common ratio, and n is the number of terms, which in our case is S7.

<u>Solution:</u>

Our start point is 1, a=1,

The common ratio is 5, r=5,

And finally, the number of terms is 7, n=7.

S_n=a\frac{1-r^n}{1-r} \\=(1)\frac{1-(5)^{(7)}}{1-(5)} \\=\frac{1-78125}{1-5} \\=\frac{-78124}{-4}\\=19531

The answer is [A] 19531.

7 0
3 years ago
Read 2 more answers
160 is 120% of what number?
LuckyWell [14K]
120 % = 160

---------------------------------------------------------------------------
Find 1 % :
---------------------------------------------------------------------------
120% = 160
1% = 160 ÷ 120
1% = 4/3

---------------------------------------------------------------------------
Find 100% :
---------------------------------------------------------------------------
1% = 4/3
100% = 4/3 x 100
100% = 133 1/3

---------------------------------------------------------------------------
Answer: 160 is 120% of 133 1/3
---------------------------------------------------------------------------
8 0
3 years ago
Read 2 more answers
7 tenths times 10 is another problem that i need help on
Elza [17]
Hi there!

7 tenths times 10 is pretty easy and can be done on a calculator.
7 tenths is 0.7 in standard form.

0.7 × 10 = 7

Because if you think about it...
Tenths is like being dropped down by ten... then you multiply by ten which brings it back up to whole number seven. It may not make sense but that's what it is.

Hope this helps!
8 0
3 years ago
Can someone pls help?? i’ll mark brainlist
Vaselesa [24]

Answer:

D

Step-by-step explanation:

The line of symmetry is at (-1, 9).

4 0
2 years ago
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What is 2 divided by 1/7
erastova [34]

Answer:

14

Step-by-step explanation:

4 0
3 years ago
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