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tester [92]
1 year ago
8

Chloe has taken four tests this semester. Her scores on the three tests are 87, 78, and 61. If her test average is 78.5, what is

her grade on her 4th test?
Mathematics
1 answer:
aniked [119]1 year ago
6 0

n = last test

(87 + 78 + 61 + n) : 4 = 78,5

87 + 78 + 61 + n   = 78,5 x 4

n = 314 - 226

n = 88

You might be interested in
Which of the following statements best describes the value of the expression 7x + 6 when x = 5? A. The result is a fraction. B.
Ksivusya [100]

Answer: B) The result is a prime number

==================================================

Explanation:

Replace x with 5. Then use PEMDAS to simplify.

7x+6

7*5+6

35+6

41

The expression 7x+6 is equal to 41 when x = 5.

The value 41 is prime because its factors are only 1 and 41.

8 0
3 years ago
What is the perimiter, in feet, of a square whose area is 121 square feet
Ainat [17]

Square needs to have all equal sides and length and width are the same.

So sqrt the area.

sqrt 121 = 11

11 feet is the length of one side, square has 4.

So

11 * 4 = 44

The perimeter of a square (whose area is 121 feet) is 44 feet.

5 0
3 years ago
How do i solve this?
n200080 [17]
The polynomial is not factorable, so use the quadratic formula.

y^2 + 8y + 19 = 0

x = (-b +- sqrt(b^2 - 4ac))/(2a)

x = (-8 +- sqrt(8^2 - 4(1)(19))/(2 * 1)

x = (-8 +- sqrt(64 - 76))/2

x = (-8 +- sqrt(-12))/2

If you have not learned imaginary/complex numbers, then the answer is "No solution" since there is no real number solution.

If you have learned imaginary/complex numbers, then we'll continue.

x = (-8 +- 2i sqrt(3))/2

x = -4 +- i sqrt(3)
5 0
3 years ago
What best describes how to evaluate a variable expression?
Kaylis [27]
<span> To replace each letter with its value, and then finish it by doing the order of the operation/ solve it.</span>
7 0
3 years ago
Simply (4x-5)+(3x+6)
STatiana [176]

Answer:

7x+1

Step-by-step explanation:

Let's simplify step-by-step.

4x−5+3x+6

=4x+−5+3x+6

Combine Like Terms:

=4x+−5+3x+6

=(4x+3x)+(−5+6)

=7x+1

Hope this helps!

5 0
2 years ago
Read 2 more answers
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