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3 years ago

Work out the value of 1. 7/2 -a ² 2. 3x-8 = 19

Mathematics

2 answers:

Zanzabum3 years ago

8 0

Answer:

1. -45 1/2.

2. x = 9.

Step-by-step explanation:

a/b - a^b when a = 7 and b = 2

= 7/2 - 7^2

= 7/2 - 49

= -91/2

= -45 1/2.

3x - 8 = 19

3x = 19 + 8 = 27

x = 9.

ratelena [41]3 years ago

3 0

Yes it is very easy, but

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Answer:

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Step-by-step explanation:

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2 years ago

A right angle is a closed shape made up

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4 years ago

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What's the algebraic expression for 5,9,13,17,21

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4 years ago

The Insure.com website reports that the mean annual premium for automobile insurance in the United States was $1,503 in March 20

stira [4]

Answer:

a) Option A)

$H_{0}: \mu \geq 1503\\H_A: \mu < 1503$

b) Point estimate of difference = -78

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = $1,503

Sample mean, $\bar{x}$ = $1,425

Sample size, n = 25

Sample standard deviation, s = $160

We have to carry a hypothesis test that the mean annual premium in Pennsylvania is lower than the national mean annual premium.

a) First, we design the null and the alternate hypothesis

$H_{0}: \mu \geq 1503\text{ dollars}\\H_A: \mu < 1503\text{ dollars}$

b) Point estimate of the difference between the mean annual premium in Pennsylvania and the national mean

Point estimate of difference =

Mean annual premium in Pennsylvania - National mean

$\text{Point estimate} = \bar{x} - \mu = 1425 - 1503 = -78$

Thus,

Point estimate of difference = -78

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4 years ago

Dave works two jobs. He works at the grocery store making $12 per hour and works at the car wash making $15 per hour. If he work

vladimir2022 [97]

Answer:

11 hours

Step-by-step explanation:

let he works at first store x hours and at car wash y hours. Then

x+y=25

multiply by 4

4x+4y=100 ...(1)

12x+15y=333

divide by 3

4x+5y=111 ... (2)

(2)-(1) gives

y=111-100=11

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3 years ago