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
ioda
3 years ago
15

On four exams, Wallace’s grades were 79,93,91, and 68. What grade must he obtain on his fifth exam to have an 80 average?

Mathematics
2 answers:
neonofarm [45]3 years ago
7 0
(79 + 93 + 91 + 68 + x) / 5 = 80
(331 + x) / 5 = 80.....multiply both sides by 5
331 + x = 80 * 5
331 + x = 400
x = 400 - 331
x = 69 <=== he would have to make at least a 69
Leona [35]3 years ago
7 0

(79 + 93 + 91 + 68 + x) / 5 = 80

Simplify

(331 + x)/5 = 80

Multiply 5 to both sides to isolate the x.

331 + x = 400

Isolate the x. Subtract 331 from both sides

x + 331 (-331) = 400 (-331)

x = 69

69 is your answer

hope this helps

You might be interested in
Is this a right triangle?
andrey2020 [161]

Answer:

D ; Yes because the Pythagorean theorem works

Step-by-step explanation:

The measure of all three sidelengths make a right triangle

5 0
3 years ago
What is the doubling time?
marusya05 [52]
<span>The doubling time is the period of time required for a quantity to double in size or value. It is applied to population growth, inflation, resource extraction, consumption of goods, compound interest, the volume of malignant tumours, and many other things that tend to grow over time.</span>
7 0
3 years ago
Read 2 more answers
Can someone plz tell me the answer quick!!
patriot [66]
He worked 9 hours in his first job and 5 hours in his second
5 0
3 years ago
Read 2 more answers
Can someone help me understand this?
ASHA 777 [7]

< means 'less than'. 3.5 is less than 4.5, so A is correct. Since -4.5 is NEGATIVE it is less than 0. As for C, since both numbers are negative, it would be the seemingly 'smaller' number that is actually bigger. It may help to think of the numbers on a number line. In the negatives, the numbers start to go in reverse, so the further from 0 a negative number is, the smaller it is. -4.5 IS LESS than -3.5. All answers are correct.

4 0
3 years ago
Read 2 more answers
T/8 + 23 - 4 = 36. Solve for the variable. Write the answer only, do not type in T= form.
oksian1 [2.3K]
136 is the answer!!!!
6 0
3 years ago
Other questions:
  • Which algebraic expression is equivalent to the expression below 6 parentheses 2x + 7 parentheses -5
    13·1 answer
  • you want to create a rectangular display of 50 quarters with the same amount of quarters in each row. how many ways can you arra
    5·2 answers
  • What is the value of cosθ given that (−2, 9) is a point on the terminal side of θ ? 985√85
    7·2 answers
  • If a parallelogram has diagonals that are perpendicular bisectors of each other, what is the most descriptive name for it?
    13·1 answer
  • I need help with this please!! 50-[3(7-1)]/2
    5·2 answers
  • What is the interquartile range of the data set? <br><br> {33, 38, 45, 56, 57, 63, 72, 91}
    10·1 answer
  • What is the greatest common factor of 200 and 140 
    5·2 answers
  • what are the solution(s) to the quadratic equation 9x^2 = 4? a. x = 4/9 and x = -4/9 b. x = 2/3and x = -2/3 c. x = 3/2 and x = -
    13·1 answer
  • Matilda, Tanya and Renee are auditioning for a play. In how many ways can the girls fill the roles of a grandmother, mother, and
    9·2 answers
  • What does it mean for two angels form a vertical pair
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!