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Novay_Z [31]
2 years ago
9

John knows that his first 4 tests grades were 84, 79, 82, and 88. Find John's grade on the test if his average was 83.8. ​

Mathematics
1 answer:
iren2701 [21]2 years ago
7 0

Answer:

86

Step-by-step explanation:

The average is the sum of all the grades divided by the number of tests.

83.8 = (84 + 79 + 82 + 88 + x) / 5

419 = 333 + x

x = 86

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An equilateral triangle has a perimeter of 9x + 27. What is the length of each side of the triangle?
melamori03 [73]
9x=27 is the perimeter 
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7 0
3 years ago
How do you solve 2x=12+2y
Sonbull [250]
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2(x - y - 6)
2 ➡0 {It doesn't have any solution for the equation}
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The slope = 1

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7 0
3 years ago
-1/2x+3=-4x+7
borishaifa [10]
Like a first step bc. there is a denominator this will be more usefully eliminate it so what you can make it multiplied both sides by 2 
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-2/2x +2*3/2 = 2(-4x+7)/2

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hope helped 


5 0
3 years ago
The sum of two numers is 52 . The difference of the two numbers is 38 . What are the two numbers? Write the two numbers separate
Ray Of Light [21]
Let the first number be 'x' and the second number is 'y'

Equation 1: x + y = 52
Equation 2: x - y = 38

Rearranging equation 2 to make either x or y the subject
x = 38 + y

Substituting x = 38 + y into equation 1

x + y = 52
(38+y) + y = 52
38 + 2y = 52
2y = 52 - 38
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y = 7

Substitute y = 7 into either equation 1 or equation 2 to find x

x + y = 52
x + 7 = 52
x = 52 - 7
x = 45

x = 45
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8 0
3 years ago
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blagie [28]
It would be 50,000 since the 5 in the other number is in the thousands place so just multiply that by 10 in place value.
3 0
2 years ago
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