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sdas [7]
3 years ago
13

Jackie and a classmate spent a total of 20 hrs working on a chemistry project. Jackie’s classmate spent 2 hrs less time working

on the project than Jackie. How long did Jackie work on the project?
Mathematics
1 answer:
valina [46]3 years ago
7 0

Answer:

x = 11

Step-by-step explanation:

x + (x - 2) = 20

2x - 2 = 20

2x - 2 + 2 = 22 + 2

2x = 22

x = 11

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The sum of three numbers is 64. The second number is 3 more than the first. The third number is 11 less than twice the first. Fi
Cloud [144]
The first number: x
The second number: x + 3
The third number 2 * x - 11
Sum of all numbers: 65

We can write it down as an equation:

65 = x + 3 + x + 2x - 11
65 = 4x + 3 - 11
65 = 4x - 8                         / + 8 (both sides)
73 = 4x                             / ÷ 6 (both sides_
x = 18,25

Doublecheck:

The first number: 18,25
The second number 18,25 + 3 = 21,25
The third number: 2 * 18,25 - 11 = 36,5 - 11 = 25,5
Sum of all numbers: 18,25 + 21,25 + 25,25 = 65, so it's correct :)
8 0
3 years ago
3x + 7y = 21 solve for y
ddd [48]
• Move x to the other side

7y=21-3x

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y = (21-3x)/7


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Step-by-step explanation:

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