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3 years ago

I think it’s b but I’m not sure but can somebody help me

Mathematics

1 answer:

aev [14]3 years ago

4 0

Answer:

Step-by-step explanation:

The small triangle is half the size of the entire triangle. 27/2 = 13.5

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Two mechanics worked on a car. The first mechanic charged S95 per hour, and the second mechanic charged S115 per hour.

Norma-Jean [14]

The first mechanic worked for 10 hours and the second mechanic worked for 15 hours.

Step-by-step explanation:

Given,

Charges of first mechanic = $95 per hour

Charges of second mechanic = $115 per hour

Total hours = 25

Total amount charged = $2675

Let,

The number of hours worked by first mechanic = x

The number of hours worked by second mechanic = y

According to given statement;

x+y=25 Eqn 1

95x+115y=2675 Eqn 2

Multiplying Eqn 1 by 95

$95(x+y=25)\\95x+95y=2375\ \ \ \ Eqn\ 3$

Subtracting Eqn 3 from Eqn 2

$(95x+115y)-(95x+95y)=2675-2375\\95x+115y-95x-95y=300\\20y=300$

Dividing both sides by 20

$\frac{20y}{20}=\frac{300}{20}\\y=15$

Putting y=15 in Eqn 1

$x+15=25\\x=25-15\\x=10$

The first mechanic worked for 10 hours and the second mechanic worked for 15 hours.

Keywords: linear equation, elimination method

Learn more about elimination method at:

#LearnwithBrainly

6 0

3 years ago

The quotient of-54 and 9, subtracted from 8 times a number, is-18

AysviL [449]

The number is: " -3 " .
_____________________________________
Explanation:
_____________________________________
Let "x" be the "unknown number" for which we are to solve.

8x − (-54/9) = -18 ; Solve for "x" ;

→ 8x − (-6) = - 18 ;

→ 8x + 6 = - 18 ;

Subtract "6" from each side of the equation:

→ 8x + 6 − 6 = - 18 <span>− 6 ;

to get: 8x = -24 ;

Divide EACH SIDE of the equation by "8" ; to isolate "x" on one side of the equation ; & to solve for "x" ;

8x / 8 = -24 / 8 ;

to get: x = -3 .
________________________________
The number is: " -3 " .
________________________________</span>

4 0

3 years ago

Write an equation to represent 'twice a number (x) is fifty"

V125BC [204]

Hi there,

Your question is "twice a number (x) is fifty"

Recall how a number is represented by x.

Twice a number would be represented as 2x.

Therefore, to represent that twice a number is equal to 50, that would result in the expression: $2x=50$

If you're looking to solve this equation, it's often best to think about the "reverse" of the current equation.

Notice how 2 is multiplying the x.

To isolate x, divide that side by 2.

However, recall that whatever is done to one side of an equation must also be done to the other side of the equation. Therefore, you will need to divide both sides by 2.

$2x=50$

$\frac{2x}{2} = \frac{50}{2}$