1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
svp [43]
3 years ago
8

If Kevin wants a 90 average in math after 5 tests and his first 4 tests are 76, 92, 89 and 97 what does he need on the fifth tes

t for a 90 average?
Mathematics
2 answers:
gladu [14]3 years ago
8 0
Average = sum/count

current count = 4
current sum = 76+92+89+97=354

we need average = 90 = sum/5
so, we need sum = 90*5=450

To get sum 450, he needs to score 450-354=96 on his best test.

Now, (76+92+89+97+96)/5=90
Keith_Richards [23]3 years ago
4 0
You need to understand that you're solving for the average, which you already know: 90. Since you know the values of the first three exams, and you know what your final value needs to be, just set up the problem like you would any time you're averaging something.
Solving for the average is simple:
Add up all of the exam scores and divide that number by the number of exams you took.
(87 + 88 + 92) / 3 = your average if you didn't count that fourth exam.
Since you know you have that fourth exam, just substitute it into the total value as an unknown, X:
(87 + 88 + 92 + X) / 4 = 90
Now you need to solve for X, the unknown:
87
+
88
+
92
+
X
4
(4) = 90 (4)
Multiplying for four on each side cancels out the fraction.
So now you have:
87 + 88 + 92 + X = 360
This can be simplified as:
267 + X = 360
Negating the 267 on each side will isolate the X value, and give you your final answer:
X = 93
Now that you have an answer, ask yourself, "does it make sense?"
I say that it does, because there were two tests that were below average, and one that was just slightly above average. So, it makes sense that you'd want to have a higher-ish test score on the fourth exam.
You might be interested in
a hiking trail has a slope of 7/32. what is the measure of the angle it makes with the horizontal line
Ahat [919]
10 degree slope angle
5 0
3 years ago
Need help plzzzz....need this done by today
ddd [48]

For this case, we must indicate which of the given graphs corresponds to the following inequality:

y\geq 1-3x

If we substitute the point(x, y) = (0,0) we have:

0> = 1-3 (0)\\0> = 1

It is not met, so we discard options A and C.

It is observed that the lines of option B and D correspond to the equationy = 1-3x. But the dotted line of option B indicates that the region given by: y> 1-3x is plotted

Thus, the region that indicatesy\geq 1-3x is option D

Answer:

Option D


5 0
3 years ago
The owner of a bakery wanted to know what items in the store generated the most income. Based on last's month's salary, this is
kvv77 [185]

A, Bread brings the most Income ! (60% of x = 60%x)

B, 20% of the income comes from brownies and cupcakes.

C, 40% comes from others besides bread.

D, If she let go of her 12% from cupcakes, she'd be left with 88%.

If this Is correct, brainliest would be nice. <3 hope this helps.

3 0
3 years ago
What are these answers​
rusak2 [61]

Answer:

.

Step-by-step explanation:

7 0
3 years ago
What is 4 divided by 230
kifflom [539]
4 divided by 230 is 0.01739130434
Round it to 0.0174
3 0
2 years ago
Read 2 more answers
Other questions:
  • Using A=bh slove for h
    12·2 answers
  • = (-3 – (-2))+ (1 - (-4))
    14·1 answer
  • How do you Solve d+7/−3=4?
    7·1 answer
  • The random variable X has the following probability mass function.X -1 0 2 6 7P(x) 0.3 0.1 0.3 0.2 0.1Answer the next 4 question
    11·1 answer
  • BRAINLIEST
    12·2 answers
  • What is the measure of ABC?
    13·1 answer
  • A car accelerates
    6·2 answers
  • This is my last question i swear pls help
    11·2 answers
  • I need help plish k squared minus 11
    5·1 answer
  • Write 336 mi in 11.2 h as a rate in simplest form
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!