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Triss [41]
3 years ago
8

A poll agency reports that 27 % of teenagers aged 12-17 own smartphones. A random sample of 85 teenagers is drawn. Round your an

swers to at least four decimal places as needed.
Mathematics
1 answer:
Paladinen [302]3 years ago
6 0

Answer:

Mean = цр = 0.27

Step-by-step explanation:

Note: The full question is attached as picture below

Given that,  p = 27 = 0.27  and n = 85

цр = P

Mean = цр = 0.27

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I don't understand someone help me help out a barb plz.
ss7ja [257]

Answer:

Step-by-step explanation:

so you are doing 4x times 4x which = 16x

so now you do 16x-9 which = 7x

8 0
3 years ago
A retailer at an outdoor market sold 5 dresses at $36.95 each. He sold 2 more at $41.99 each and 3 at $38.95 each. He also sold
Leona [35]

Answer:

c) 333.42

Step-by-step explanation:

1st sentence: 5*36.95= 184.75

2nd: 2*41.99=83.98 & 3*38.95= 116.85

3rd: 52*(1-.40)= 31.2

Money earned: 416.78

Payed to the market: 416.78(1-.2)

Sales: 333.42

5 0
3 years ago
SIMPLIFY THIS POLYNOMIAL EXPRESSION:<br> 4 (5X2 + 2) - (-4X2 + 7).<br> + (- 3X2-5)
lana66690 [7]

Answer:

6x^2-10

Step-by-step explanation:

You add like terms. All the x^2 you add them and you add together the ones that are not multiplied by x. Make sure to distribute the negative.

5 0
3 years ago
Read 2 more answers
The value of sales at the shop decreases from 145,000 a year to 129,000 find the percentage decrease in the value of sales
iren [92.7K]

Answer:

11.0344828%

Step-by-step explanation:

145000 - 129000 = 16000.

16000/145000 = 16/145 = 0.110344828

Therefore there was a 11.0344828% decrease

5 0
3 years ago
Read 2 more answers
Factor the polynomial by grouping. 12x^x+x−13
tekilochka [14]

Answer:

  (x -1)(12x +13)

Step-by-step explanation:

You are looking to rewrite the middle term as the sum of terms that have factors of (12)(-13) that have a total of +1. Those factors are -12 and +13, so the expression you are factoring by grouping is ...

  12x^2 +13x -12x -13

  = x(12x +13) -1(12x +13)

  = (x -1)(12x +13)

5 0
3 years ago
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