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2 years ago

What is an algebraic expression to represent the perimeter of a rectangle with a width of x+5 and a length of 3x+10?

1 answer:

5 0

We know that the area of a rectangle is equal to the width multiplied by the length. So in this case the algebraic expression is (x+5)*(3x+10). You get 3x^2 +10x +15x +50= 3x^2 +25x +50.

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The decimal -2.97 is the solution to which subtraction problem?

Nat2105 [25]

Answer:
-6.1 - (-3.13) = -2.97

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2 years ago

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Easy a) -2,-5.-8.-11,...

aleksklad [387]

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What point would you have when (-7, 3) is reflected over the line y=x?

Mekhanik [1.2K]

Answer:

I believe its A.

Step-by-step explanation:

It usually the same numbers but backwards sometimes it just a positive or a negative different.

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3 years ago

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A magazine ad states that 4 out of 7 doctors recommend Flash toothpaste. if 1400 doctors were surveyed, how many doctors recomme

Paladinen [302]

Answer:

The number of doctors recommended flash toothpaste 800.

Step-by-step explanation:

Given:

A magazine ad states that 4 out of 7 doctors recommend Flash toothpaste.

Now, to find the numbers of doctors recommended flash toothpaste if 1400 doctors were surveyed.

Let the number of doctors recommended be $x$ .

And the total number of doctors surveyed were 1400.

So, as given 4 out of 7 doctors recommend flash toothpaste.

So, 4 equivalent to 7 = $\frac{4}{7}$ .

And, $x$ equivalent to 1400 = $\frac{x}{1400}$ .

Thus, we set the proportion and solve by cross multiplication method:

$\frac{4}{7} =\frac{x}{1400}$

By cross multiplying we get:

$5600=7x$

Dividing both sides by 7 we get:

$800=x$

$x=800.$

Therefore, the number of doctors recommended flash toothpaste 800.

3 0

3 years ago

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4 x plus 8 y equals 40, when y equals 0.8?

Over [174]

Answer:

$\boxed{ \bold{ \huge{ \boxed{ \sf{x = 8.4}}}}}$

Step-by-step explanation:

Given, y = 0.8

To find : value of x

$\sf{4x + 8y = 40}$

plug the value of y

$\longrightarrow{ \sf{4x + 8 \times 0.8 = 40}}$

Multiply the numbers: 8 and 0.8

$\longrightarrow{ \sf{4x + 6.4 = 40}}$

Move 6.4 to right hand side and change it's sign

$\longrightarrow{ \sf{4x = 40 - 6.4}}$

Subtract 6.4 from 40

$\longrightarrow{ \sf{4x = 33.6}}$

Divide both sides by 4

$\longrightarrow{ \sf{ \frac{4x}{4} = \frac{33.6}{4} }}$

Calculate

$\longrightarrow{ \sf{x = 8.4}}$

Hope I helped!

Best regards ! :D

5 0

2 years ago