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-BARSIC- [3]
3 years ago
14

What is 4(0.5x + 2.5y - 0.7y - 1.3y + 4) simplified?

Mathematics
1 answer:
Maslowich3 years ago
4 0
4(0.5x + 2.5y - 0.7y - 1.3y + 4)
multiply 4 by all in parentheses

(4*0.5x)+(4*2.5y)+(4*-7y)+(4*-1.3y)+(4*4
=2x+10y-28y-5.2y+16

combine like terms
=2x-23.2y+16

ANSWER:
Expression simplified 2x-23.2y+16

Hope this helps! :)
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Can someone help me with this Please​
horrorfan [7]

Answer:

314 cm²

Step-by-step explanation:

To find the area of a circle, use the formula A = πr² by substituting r = 10.

A = πr² = π10² = 314 cm²

8 0
3 years ago
A cylinder has radius r and height h. A. How many times greater is the surface area of a cylinder when both dimensions are multi
Ierofanga [76]

Answer: A. Factor 2 => 4x greater

                   Factor 3 => 9x greater

                   Factor 5 => 25x greater

Step-by-step explanation: A. A cylinder is formed by 2 circles and a rectangle in the middle. That's why surface area is given by circumference of a circle, which is the length of the rectangle times height of the rectangle, i.e.:

A = 2.π.r.h

A cylinder of radius r and height h has area:

A_{1} = 2πrh

If multiply both dimensions <u>by a factor of 2</u>:

A_{2} = 2.π.2r.2h

A_{2} = 8πrh

Comparing A_{1} to A_{2} :

\frac{A_{2}}{A_{1}} = \frac{8.\pi.rh}{2.\pi.rh} = 4

Doubling radius and height creates a surface area of a cylinder 4 times greater.

<u>By factor 3:</u>

A_{3} = 2.\pi.3r.3h

A_{3} = 18.\pi.r.h

Comparing areas:

\frac{A_{3}}{A_{1}} = \frac{18.\pi.r.h}{2.\pi.r.h} = 9

Multiplying by 3, gives an area 9 times bigger.

<u>By factor 5</u>:

A_{5} = 2.\pi.5r.5h

A_{5} = 50.\pi.r.h

Comparing:

\frac{A_{5}}{A_{1}} = \frac{50.\pi.r.h}{2.\pi.r.h} = 25

The new area is 25 times greater.

B. By analysing how many times greater and the factor that the dimensions are multiplied, you can notice the increase in area is factor². For example, when multiplied by a factor of 2, the new area is 4 times greater.

3 0
3 years ago
I need help
Gwar [14]

Answer:

Integers are always closed under subtraction, addition and multiplication, not division though. Hope this helped! :D

Step-by-step explanation:

4 0
2 years ago
The running time (in minutes) of a TV episode is 60-2c where c is the number of commericals aired during the episode. What is th
slava [35]

Answer:

60-2(15)=?

60-30=30

30 minutes

5 0
2 years ago
Find the x-intercept of the graph of the equation: 4x + y = 3
Anon25 [30]

The x-intercept is where the y is zero. So, we have just enough info :) Simply plug in 0 for y in order to find x.

4x + 0 = 3

x = 3/4

so the x intercept is (3/4, 0)

__________________

Please let me know if you have any questions :3

7 0
2 years ago
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