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Advocard [28]
3 years ago
15

I need help fast, Which expressions are equivalent to 2(25)? Select each correct answer.

Mathematics
1 answer:
MArishka [77]3 years ago
3 0

the answer is A. because 20+5 in the parentheses is equal to 25 in the question

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A chemical company claims that its new additives increases gasmileage. As a pilot study, the company send 36 cars fueled withthe
8090 [49]

Answer:

Check Explanation

Step-by-step explanation:

Normally the mean mileage for the 36 cars without the additive is 25 miles per gallon of gas with a standard deviation of 2.4 mpg

With the additive, the mileage improves to 25.8 mpg.

The sample mean without additive is 25 mpg

The standard deviation of the distribution of sample means for mileage without additive = σₓ = (σ/√n)

where σ = normal standard deviation = 2.4 mpg

n = Sample size = 36

σₓ = (σ/√n) = (2.4/√36)

σₓ = 0.4 mpg

So, a normal distribution of sample means for mileage without gas should have 95% of the possible values between 2 standard deviations of the mean. That is, within 24.2 mpg and 25.8 mpg.

Therefore, a mileage of 25.8 mpg with the additive added cannot point at a significant effectiveness of the additive as this data has shown that 25.8 mpg is within the possible values for sample means for mileage without the use of additives.

Although, it does point at an improved performance with the additive because a sample mean of 25.8 mpg without the additive is on the outskirts of possible sample mean values.

Hope this Helps!!!

3 0
4 years ago
Maria's front yard is shaped like a trapezoid with the dimension 5ft 4ft and 7ft . What is the area of her front yard.
Art [367]

Answer:

The area of her front yard is <u>31.5 ft²</u>.

Step-by-step explanation:

Given:

Maria's front yard is shaped like a trapezoid with the dimension 5ft, 4ft and 7ft.

Now, to find the area of her front yard.

Dimension of front yard:

Base (a) = 5 ft.

Second base (b) = 4 ft.

Height (h) = 7 ft.

So, to getting the area of trapezoid we put formula:

Area\ of\ trapezoid=\frac{a+b}{2} h

Area=\frac{5+4}{2} \times 7

Area=\frac{9}{2} \times 7

Area=4.5\times 7

Area=31.5\ ft^2.

Therefore, the area of her front yard is 31.5 ft².

3 0
3 years ago
What is the vertex of the graph of y = 2(x − 3)2 + 4? (1 point)
Alexeev081 [22]

The vertex form of the quadratic function:

f(x)=a(x-h)^2+k

(h, k) - vertex

We have

y=2(x-3)^2+4

h = 3, k = 4

Therefore your answer is:

<h3>C. (3, 4)</h3>
3 0
3 years ago
Plot triangle ABC with coordinates A(-4,5),B(-1,5),C(-1,1)​
slavikrds [6]

Answer:

:D

Step-by-step explanation:

5 0
3 years ago
What number has the value as 50 tens
soldier1979 [14.2K]
50 tens = 50 x 10

50 x 10 = 500

your answer is 500

hope this helps
7 0
3 years ago
Read 2 more answers
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