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
katovenus [111]
2 years ago
8

PLEASE HELP WITH THIS MATH SUM

Mathematics
2 answers:
Studentka2010 [4]2 years ago
5 0

How many questions did David answer correctly? David answered 48 questions correctly.

We’ll call the number of correct answers a, incorrect answers b.
60 questions on the test gives us:
a + b = 60
And the scoring gives us:
4a - 7b = 108

First we’ll solve for a in terms of b:
a = 60 - b
The we’ll substitute that value for a in the second equation to get a numerical value for b:

4(60 - b) - 7b = 108
240 - 4b - 7b = 108
-11b = -132
b = 12

Now we go back to the first equation and get a numerical value for a:
a = 60 -b
a = 60 - 12
a = 48

Check the math with the scoring equation:
4(48) - 7(12) =
192 - 84 = 108

Please lmk if you have any questions.
Firdavs [7]2 years ago
3 0

Answer:

27 questions correct

Step-by-step explanation:

Well 108 marks and 4 marks for each correct,techinally you can’t subtract since 108 is the final score, and the thing was already subtracted so \divide.

108/4= 27

27 correct answers

You might be interested in
Solve for L:<br> P=2L+2W
Korvikt [17]

Answer:

L=\frac{1}{2}P-W

Step-by-step explanation:

Let's solve for L.

P=2L+2W

Step 1: Flip the equation.

2L+2W=P

Step 2: Add -2W to both sides.

2L+2W+-2W=P+-2W

2L=P-2W

Step 3: Divide both sides by 2.

\frac{2L}{2}=\frac{P-2W}{2}

L=\frac{1}{2}P-W

Answer:

L=\frac{1}{2}P-W

4 0
2 years ago
52 -46<br> Plz answer my question
VLD [36.1K]

Answer:

the answer for this problem is 6

4 0
3 years ago
Read 2 more answers
PLS HELP ME
Anuta_ua [19.1K]

Interest on interest, or compound interest, is the adding of interest to the principal sum of a loan or deposit. Mike's account balance after 21 years is $69,131.44.

<h3>What is compound interest?</h3>

Interest on interest, or compound interest, is the adding of interest to the principal sum of a loan or deposit. It's the outcome of reinvesting interest rather than paying it out so that interest is received on the principal plus previously collected interest in the next quarter.,

A = P(1+ \dfrac{r}{n})^{nt}

where A is the final amount

P is the principal amount

r is the rate of interest

n is the number of times interest is charged in a year

t is the number of years

The principal amount that Mike invested is $29,000. The rate of interest is 7.24% compounded daily, for 21 years. Therefore, the account balance after 21 years is

\text{Account Balance after 21 years} = 29,000(1+\dfrac{0.0724}{365})^{(365 \times 21)}

                                                     = $69,131.44

Hence, Mike's account balance after 21 years is $69,131.44.

Learn more about Compound Interest:

brainly.com/question/25857212

#SPJ1

3 0
1 year ago
What's another fraction for 3/10
Eduardwww [97]
6/20 could be another fraction
7 0
3 years ago
Read 2 more answers
Write a multiplication equation using one whole number and one fraction that have a product18/8
kotegsom [21]
1/4 * 9 = 18/8
               I hope this helped  :)
8 0
3 years ago
Other questions:
  • Insert &lt; &gt;, or= to make the following sentence true.
    10·2 answers
  • What is greater 6 pints or 60 fluid ounces
    11·2 answers
  • Which formulas can be used to find the surface area of a right prism where p is the perimeter of the base, h is the height of th
    7·1 answer
  • Lmk ASAP please <br><br> Express the percent as a decimal.<br><br> 27%
    14·2 answers
  • Correct 0.04945 to two significant figures​
    13·1 answer
  • maria is painting her bedroom. she has 4 2/3 gallons of paint. she needs 3/4 gallon for the trim and 3 1/2 gallons for the walls
    10·1 answer
  • Pls I need help with trig! number 17 only
    11·1 answer
  • What is the solution to 5x - 4 = 16
    6·1 answer
  • 1 cm 12 cm 1 cm Find the volume of the rectangular prism.​
    9·1 answer
  • From a functionalist view point, the U.S. economic system would be seriously strained if we completely eliminated poverty level
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!