Mathematics: Which value of the variable m satisfies the equation 20 = -2(4m - 5)

Which value of the variable m satisfies the equation

Ответ:

jose145

10.12.2021

Mathematics

m = - 1.25

Step-by-step explanation:

20 = - 2(4m - 5) ← divide both sides by - 2

- 10 = 4m - 5 ( add 5 to both sides )

- 5 = 4m ( divide both sides by 4 )

- $\frac{5}{4}$ = m , that is

m = - 1.25

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Ответ:

zayboogey04

10.12.2021

Mathematics

Question:-

which value of the variable m satisfies the equation 20 = -2(4m - 5)

__________________-Distribute

20 = -2(4m - 5)

20 = -8m + 10

____Subtract 10 from both sides of the equation.

20 = -8m + 10

20 - 10 = -8m + 10 - 10

____Simplify

20 - 10 = -8m + 10 - 10

10 = -8m + 10 - 10

Simplify

10 = -8m + 10 - 10

10 = -8m

____Divide both sides of the equation from the same term

10 = -8m

$\frac{10}{ - 8} = \frac{ - 8m}{ - 8}$

____Divide

$\frac{10}{ - 8} = \frac{ - 8m}{ - 8}$

$\frac{ - 5}{4} = \frac{ - 8m}{ - 8}$

(Cancel -8, In the numerator and the denominator)

$\frac{ - 5}{4} = m$

__________________Final -

$m = \frac{ - 5}{4}$

_______In decimal form,

m = -1.25

__________________

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Ответ:

ariellllm

28.01.2020

Mathematics

Total surface area equals area of 5 rectangular faces + 2 pentagonal faces

Area of 5 rectangular faces

$=5 \times 6 \times 9 km^2$

=270 km^2

Area of 2 pentagonal faces can be found by drawing 5 isosceles triangles with height as shown in the diagram and multiply the result by 2.

$=5 \times \frac{1}{2} \times 9 \times 6.2 \times 2km^2$

=279km^2

The toatal surface area is

=270+279=549 km^2

The correct answer is A

What is the total surface area of the drawing? a. 549 km2 b. 256 km2 c. 564 km2 d. 265 km2

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Which value of the variable m satisfies the equation 20 = -2(4m - 5)

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