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3 years ago

Help 15 points ! -8m -3m

Mathematics

1 answer:

Brut [27]3 years ago

8 0

Answer:

-11m

Step-by-step explanation:

subtract the expression

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A house costs 36% more today than when it built.if the cost of the house today is $333200,find its cost when it was built

Brrunno [24]

Answer:

The cost of house was $245000 when it was built.

Step-by-step explanation:

Given that:

Cost of the house today = $333200

Percent increase in today's price = 36%

Let,

x be the cost of house when it was built.

100 be the percentage when the house was built.

Percentage of house price today = (100+36)% = 136%

136% of x = 333200

$\frac{136}{100}*x=333200\\1.36x=333200$

Dividing both sides by 1.36

$\frac{1.36x}{1.36}=\frac{333200}{1.36}\\x=245000$

Hence,

The cost of house was $245000 when it was built.

3 0

3 years ago

Dillon pays x dollars to get a haircut. He gives the stylist a

Svetlanka [38]

Answer:

C. 1.2x

Step-by-step explanation:

He pays 1 x for his haircut, and an additional 20% on top of that, or an additional 0.2x. If you write that as an expression, you can simplify it like this:

$1x+0.2x\\1.2x$

You can also work it out by multiplying by 1.2 as stated in answer C. If his haircut costs $10, adding a 20% tip of $2 is the same as multiplying by 1.2.

$10\times1.2=12$

3 0

2 years ago

An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 160 engines

abruzzese [7]

Answer:

Test statistic Z = 2.1097

Step-by-step explanation:

Step(i):-

Given that size of the sample 'n' = 160

Given that mean of the Population(μ) = 5.3pounds/square inch

The Standard deviation of the population(σ) = 0.6

Mean of the sample(x⁻) = 5.4

Level of significance =0.1

Step(ii):-

Test statistic

$Z = \frac{x^{-}-mean }{\frac{S.D}{\sqrt{n} } }$

$Z = \frac{5.4-5.3}{\frac{0.6}{\sqrt{160} } }$

Z = 2.1097

Final answer:-

Test statistic Z = 2.1097

5 0

3 years ago

A company uses a computer to identify their 600 most loyal customers from its database and then surveys those customers to find

8_murik_8 [283]

The population would be the total number of customers found in the database.

The sample would be BIASED because the computer will be identifying the 600 most loyal customers from the database.

Since their survey would be about the service of the company, choosing the most loyal customers will ensure that they would have a positive feedback on the service of the company. Customers build loyalty to a business when it has good service and staff.

6 0

3 years ago

Which of the following are examples of inferential statistics?

Natali [406]

Testing random samples of lightbulbs produced by a company to confirm they work and testing a new drug on a random sample of patients to see how effective it is at curing the flu are examples of inferential statistics. The correct option among all the options that are given in the question are option "C" and option "E".

5 0

4 years ago