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labwork [276]
2 years ago
13

How do I solve this?

Mathematics
1 answer:
boyakko [2]2 years ago
3 0
See below for solution. Hope this is helpful

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Add. [12 − 6] [−2 14] (matrix format)
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Answer:

The answer is C

Step-by-step explanation:

12-(-2)=10 -6+14=8 1+5=6 -10+15=5

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Find the LCM of 52 and 39
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Jan spends part of her year as a member of a gym. She then finds a better deal at another gym, so she cancels her membership wit
valkas [14]

She spent 8 months in the 1st gym and 4 months in the 2nd gym

Step-by-step explanation:

Jan spends part of her year as a member of a gym.

  • She then finds a better deal at another gym so she cancels her membership with the first gym after x months
  • She spends the rest of the year, y months, with the second gym
  • The membership to the first gym costs $75 per month, while the membership for the second gym costs $45 per month
  • She ended up spending a total of $780 over the course of the year

We need to find how much time she spent at each gym

∵ She spent x months in the 1st gym

∵ She spent y months in the 2nd gym

∵ Her course is a year

- There are 12 months in a year

∴ x + y = 12 ⇒ (1)

∵ The membership to the first gym costs $75 per month

∵ The membership to the second gym costs $45 per month

∵ She ended up spending a total of $780 over the course

∴ 75x + 45y = 780 ⇒ (2)

Now we have a system of equations to solve it

Multiply equation (1) by -45 to eliminate y

∵ -45x - 45y = -540 ⇒ (3)

- Add equations (2) and (3)

∴ 30x = 240

- Divide both sides by 30

∴ x = 8

- Substitute the value of x in equation (1) to find y

∵ 8 + y = 12

- Subtract 8 from both sides

∴ y = 4

She spent 8 months in the 1st gym and 4 months in the 2nd gym

Learn more:

You can learn more about the system of equations in brainly.com/question/2115716

#LearnwithBrainly

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3 years ago
A mechanic charges $330 for 6 hours of labor.
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For 6 hours charges $330

for 9 hours charges x
---------------------------------

 x = 9*330/6 = 495 so choice C. is right 
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An automobile manufacturer wants to find out what types of product-related problems its customers are experiencing. The best met
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A customer survey?  Or a random sampling survey?
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3 years ago
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