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Lubov Fominskaja [6]
4 years ago
10

Marcello is replacing a rectangular sliding glass door with dimensions of (x + 7) and (x + 3) feet. The area of the glass door i

s 45 square feet. What are the length and width of the door? Complete the explanation of how you got your answer.
I found the area of the glass door by multiplying the length by the width, which is _____. I set this product, which represents the area in terms of x equal to ____ . Then, I rewrote the equation so one side was 0 and solved for x and got x=____. A dimension of the door can't be negative so x = ____ .
Mathematics
1 answer:
amm18124 years ago
7 0

Answer:

ugh i cant find the answer

Step-by-step explanation:

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Is the given value of the variable a solution of the equation: 16 - u = -4; u = 20
lawyer [7]

Answer:

a. yes

Step-by-step explanation:

If 16 - u = -4 and u = 20:

16 - 20 = -4

The equaton is correct, therefore the given value of u is the solution to the equation.

3 0
3 years ago
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the atomic number and atomic weight of chlorine element is 17 and 35 respectively. Calculate the number of proton, neutron and e
grin007 [14]

A chlorine nucleus will contain: Number of protons Z = 17. Number of protons + neutrons A = 35. Number of neutrons N = 35 - 17 = 18.

4 0
3 years ago
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6 0
4 years ago
What is the expression in factored form?<br><br> -20x^2 - 12x
artcher [175]

Answer:

-4x(5x-3)

Step-by-step explanation:

-20x^2 - 12x

-20x^2 = -4*5*x*x = -2*2*5*x*x

-12x = -4*3*x = -2*2*3*x

The common terms are -2*2*x = -4x.  Whats left goes inside the parentheses

-4x(5x-3)

4 0
4 years ago
What is the standard deviation of a sampling distribution called?
GarryVolchara [31]

Answer: Standard error.

Step-by-step explanation:

If the population is normally distributed , then the standard deviation of a sampling distribution of the sample mean [tex]\overline{x}[/tex] is known as standard error which depends on population standard deviation (\sigma) and the sample size (n).

\sigma_x=\dfrac{\sigma}{\sqrt{n}}

It measure the variability in the sample statistics that happens by chance.

Thus, the standard deviation of a sampling distribution is called the <u>standard error</u>.

8 0
3 years ago
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