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3 years ago

Twice a certain number minus 7 is equal to 5. What is the number.

Mathematics

2 answers:

Mandarinka [93]3 years ago

8 0

Answer:

Step-by-step explanation:

2x-7=5

2x=12

x=6

x=the varible that represents the number

zepelin [54]3 years ago

6 0

Answer:

Step-by-step explanation:

Let the number be x.

2x - 7 = 5

Add 7 to both sides.

2x = 5 + 7

2x = 12

Divide 2 into both sides.

x = 12/2

x = 6

The number is 6.

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This figure consists of two semicircles and a rectangle.

Elis [28]

2 semi circles form one full circle with a circumference of 68pi = 213.52

Rectangle has a perimeter of (68+108)*2 = 353

Total perimeter = 566.52m

8 0

3 years ago

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LenaWriter [7]

I believe the answer is A.

5 0

3 years ago

I need the answer to this

adell [148]

Answer:

8 Hours

Step-by-step explanation:

Since 4 painters painting one house takes 14 hours, then one person would take 56 hours to paint the whole house. Hence, 4 x 14 = 56. If 7 people painted the house, then 8 hours would be needed since 56 / 7 = 8.

4 people x 14 hours = House

56 hours = House

56 hours is required to paint a house.

7 people x H hours= House

7 people x H hours = 56

(7 people x H hours)/ 7 = 56 / 7

You divide 7 on both sides to isolate H on one side.

H hours = 8

So H = 8 which is the amount of hours needed.

I Hope This Helps :)

6 0

2 years ago

Can someone please help with these volume equations? 10th grade geometry. will reward brainly

prisoha [69]

Answer:

First picture - 20.42 m

Second picture - 12.9 m

Step-by-step explanation:

------------------------------------------------------------------------------------------------------------

Formula for pyramid:

$V=b^2\frac{h}3$

Where,

b = base - 3.5 m

h = height - 5 m

Thus,

$V=3.5^2\frac{5}{3}$

$20.41667m^3$ ≈ $20.42m^3$

------------------------------------------------------------------------------------------------------------

Formula for pyramid:

$V=b^2\frac{h}3$

Where,

b = base - 3 m

h = height - 4.3 m

Thus,

$V = 3^2\frac{4.3}{3}$

$12.9m^3$

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<u><em>Kavinsky</em></u>

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2 years ago

A variable that is manipulated by an experimenter to explore its relationship to other variables is a(n) _____ variable.

LuckyWell [14K]

Answer:

Independent variable

Step-by-step explanation:

Independent variable :

An independent variable is a variable that speaks to an amount that is being controlled in a trial. A needy variable speaks to an amount whose worth relies upon those controls.

It is the variable in a equation that may have its worth unreservedly picked without thinking about estimations of some other variable.

For example :

In equation $y=5x+3$ , x is an independent variable

5 0

3 years ago