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qwelly [4]
3 years ago
10

Malena has taken four tests so far. Her scores are 92%,80%,88%,93%. What score does she need to get on the fifth test to raise h

er average grade to 90%?
Mathematics
1 answer:
hammer [34]3 years ago
4 0
To calculate the average you add up all the scores and divide by the number of scores (5)
add all the current test scores and allow X to be the unknown score:
92+80+88+93+X: or 353 + X

set up equation:

(353+X)
______    =  90
    5

Multiply both side of the equation by 5 to clear the fraction resulting in:

353+X=450

Subtract 353 from both sides of the equation:

x = 97

So the test score needed to get a 90 average is 97.
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Answer:

yes

Step-by-step explanation:

you can either call it the narrator or the speaker.

~Ren

6 0
3 years ago
for the equation x over 3 equals 15 the student found the value of x to be 5 explain the error what is the correct answer
otez555 [7]
If you divide 5 over 3 you get the decimal 1.6, not 15.
the correct answer would be 45. 
how do i get that? read below.
________________________________
to solve:
\frac{x}{3} = 15
1.multiply each side by 3, to get the 3 on the left side to cancel out. so you get x = 15 times 3.
2. 15 * 3 = 45


5 0
4 years ago
Which of the quadratics has a graph with only one x-intercept? A) y = 2x2 + 4 B) y = x2 - 8x + 16 C) y = 2x2 - 8x + 20 D) y = -2
xeze [42]
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5 0
4 years ago
Read 2 more answers
A pet store is selling dogs for $140 and cats for $70. If 28 pets were sold and the
Nina [5.8K]

Answer:

x+y=28. 70x+140y=3360. 8 cats, 20 dogs were sold.

Step-by-step explanation:

hope it helps :)

8 0
3 years ago
Suppose every interior angle in a regular polygon is approximately 128.57∘. What kind of polygon is this?
Lelu [443]

The polygon with 128.57° as every interior angle is a septagon.

<h3>How to determine the polygon</h3>

If the interior angle = 128. 57°

Using ( n-2) × 180 = sum of interior angles

Let's say n= 7

We have that,

(7-2) × 180 = 900

Let's find out the polygon

= 7 × 128.57

= 900

A polygon with seven sides is a septagon

Thus, the polygon with 128.57° as every interior angle is a septagon.

Learn more about polygons here:

brainly.com/question/1592456

#SPJ1

5 0
2 years ago
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