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Serhud [2]
3 years ago
11

Help!!! I’ll give brainliest

Mathematics
1 answer:
MrMuchimi3 years ago
6 0

Answer:

B

Step-by-step explanation:

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Express 3/10 + 45/100 as a fraction with denominator 100
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   3/10 + 45/100
= 30/100 + 45/100
= 75/100
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Two numbers are randomly selected on a number line numbered from 1 to 9. Match each scenario to its probability.
Rama09 [41]

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NOt sure

Step-by-step explanation:

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Randomly picking a green card from a standard deck
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Two mechanics worked on a car. The first mechanic worked for 5 hours, and the second mechanic worked for 15 hours. Together they
madam [21]

Answer: The mechanic who worked 5 hours charged $45 per hour while the mechanic who worked for 15 hours charged $105 per hour.

Step-by-step explanation:

Let x be the rate of mechanic who worked 5 hours

And y, the rate of mechanic who worked 15 hours

Represent the question in an equation

x + y = 150.............. equation 1

5x + 15y = 1800........equation 2

x + y = 150, x = 150 -y

Substitute the value of x into equation 2 to get y

= 5 (150 -y) + 15y = 1800

Then open the bracket

750 - 5y + 15y = 1800

750 + 10y = 1800

10y = 1800 - 750

10y= 1050 (divide both sides by 10)

y = 1050/10

y = 105

Substitute the value of y into equation 1 to get the value of x

x + 105 = 150

x = 150 - 105

x = 45

Therefore, the mechanic who worked 5 hours charged $45 per hour while the mechanic who worked for 15 hours charged $105 per hour.

I hope this is clear, mark as brainliest please

3 0
3 years ago
Use the points (2, 14) and (10, 22) to write the equation of the line of best fit shown
luda_lava [24]

Answer:

The equation of the line best fit is y = x + 12

Step-by-step explanation:

The form of the linear equation is y = m x + b, where

  • m is the slope of the line
  • b is the y-intercept

The rule of the slope is m = \frac{y2-y1}{x2-x1} , where

  • (x1, y1) and (x2, y2) are two points on the line

∵ The line passes through points (2, 14) and (10, 22)

∴ x1 = 2 and y1 = 14

∴ x2 = 10 and y2 = 22

→ Substitute them in the rule of the slope above to find it

∵ m = \frac{22-14}{10-2}=\frac{8}{8}=1

∴ m = 1

→ Substitute it in the form of the equation above

∴ y = (1)x + b

∴ y = x + b

→ To find b substitute x by 2 and y by 14 in the equation

∵ 14 = 2 + b

→ Subtract 2 from both sides

∴ 14 - 2 = 2 - 2 + b

∴ 12 = b

→ Substitute it in the equation

∴ y = x + 12

∴ The equation of the line best fit is y = x + 12

8 0
3 years ago
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