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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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What is the inverse of the function f(x) = 2x – 10?
Nadusha1986 [10]

Answer:

f⁻¹(x) = (1/2)x +5

Step-by-step explanation:

In y = f(x), swap the variables, then solve for y. The expression you get is f⁻¹(x).

... y = 2x -10

... x = 2y -10 . . . . . . swapped variables

... x +10 = 2y . . . . . add 10

... (1/2)x + 5 = y . . . . divide by 2

... f⁻¹(x) = (1/2)x + 5 . . . . . . rewrite using function notation

6 0
3 years ago
A stunt man wants to drive a car off a ramp at an angle of 35∘ from the ground. He already has a ramp with an angle of 15∘. He p
eduard

Answer:

The second ramp needs to have 25°.

Step-by-step explanation:

Required ramp angle for driving the car from the ground = 35°.

First ramp angle = 15°

Therefore, second ramp angle equals required ramp angle minus first ramp angle, which is = 35° - 15° = 20°

The 20° ramp angle will make the total ramp angle to be equal to 35°.

That is 15° + 20° = 35°

4 0
2 years ago
How can you you tell when a pattern shows counting on by tens
astraxan [27]
You can ise repeated reasonings
6 0
3 years ago
Neal is tiling his kitchen filler. Each square tile is 1 square foot. Neal uses 6 rows of tiles with 9 tiles in each row. What i
timofeeve [1]

Answer:

54

Step-by-step explanation:

9*6=54

6 rows of 9 titles

6 0
3 years ago
Sierra left $4.50 as a tip for a waiter. THis was 18% of the bull before the tip, How much was her total bill before the tip?
andreyandreev [35.5K]

let's say the bill without the tip is "x" amount, so that'd be the 100% of the bill, but we also know that 4.50 is the 18% of "x".

so if 4.50 is the 18% of "x", how much is "x"?


\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} 4.50&18\\ x&100 \end{array}\implies \cfrac{4.5}{x}=\cfrac{18}{100}\implies 450=18x \\\\\\ \cfrac{450}{18}=x\implies 25=x

4 0
3 years ago
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