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3 years ago

Select all the expressions that are equivalent to 12b-18

Mathematics

2 answers:

VLD [36.1K]3 years ago

8 0

A is the answer
since -3 x -4b would equal 12b and -3 x 6 would equal -18
therefore it equaling 12b-18

mylen [45]3 years ago

6 0

Answers will be A and B

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Solve the equation. Check your solution. (1/2 is a fraction for one half <br> s-1/2=1/2

Alchen [17]

Answer:

$s = 1$

Step-by-step explanation:

Given

$s - \frac{1}{2} = \frac{1}{2}$

Required

Solve for s

$s - \frac{1}{2} = \frac{1}{2}$

Add $\frac{1}{2}$ to both sides

$s - \frac{1}{2} + \frac{1}{2} = \frac{1}{2} + \frac{1}{2}$

Take LCM

$s + \frac{-1+1}{2} = \frac{1+1}{2}$

$s + \frac{0}{2} = \frac{2}{2}$

$s +0 = 1$

$s = 1$

4 0

3 years ago

Can someone please help me with this?

mash [69]

Answer:

see explanation

Step-by-step explanation:

∠c = ∠ a = 47° ( vertical angles )

∠c and ∠b form a straight angle and are supplementary, thus

∠c + ∠b = 180, that is

47 + ∠b = 180 ( subtract 47 from both sides )

∠b = 133°

∠d = ∠b = 133° ( vertical angles )

That is a = c = 47° and b = d = 133°

The sum of the 4 angles = 133° + 47° + 47° + 133° = 360°

360° is the sum of the angles round a point , hence answer is correct

3 0

3 years ago

A scientist enlarged a circular portion of a microscope slide to make it easier to count the number of bacteria present in the s

Tema [17]

Answer:

Option B. $212.1\ cm^{2}$

Step-by-step explanation:

step 1

Find the central angle of the shaded sector

Remember that the diameter divide the circle into two equal parts ( 180 degrees each part)

Let

x -----> the measure of the central angle of the shaded sector

∠x+72°=180°

∠x=180°-72°=108°

step 2

Find the area of the circle

The area of the circle is

$A=\pi r^{2}$

we have

$r=15\ cm$

assume

$\pi=3.1416$

substitute

$A=(3.1416)(15)^{2}$

$A=706.86\ cm^{2}$

step 3

Find the area of the shaded sector

Remember that the area of the complete circle subtends a central angle of 360 degrees

by proportion find the area of a sector by a central angle of 108 degrees

$\frac{706.86}{360}=\frac{x}{108}\\ \\x=706.86*108/360\\ \\x=212.1\ cm^{2}$

8 0

3 years ago

George is twice the age of Mike minus 5. The sum of George and Mike's ages is 31. How old is George and write an equation to rep

Temka [501]

Answer:

George is 19

Step-by-step explanation:

George is g and Mike is m

g = 2m - 5
g + m = 31

Substitute g in the second equation

2m - 5 + m = 31
3m - 5 = 31
3m = 36
m = 12

Finding g

g = 2*12 - 5 = 24 - 5 = 19

6 0

3 years ago

Estimate the percent of each number. 47% of 77

Anettt [7]

ANSWER

36 .19

EXPLANATION

We want to estimate

$47\% \: of \: 77$

This is the same as

$\frac{47}{100} \times 77$

$\frac{47}{100} \times \frac{77}{1}$

We multiply the numerators to get,

$\frac{3619}{100}$

We convert to decimals to get

$36.19$

5 0

3 years ago