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
babymother [125]
3 years ago
10

Help simply. this math problem

Mathematics
2 answers:
saveliy_v [14]3 years ago
4 0

- 4 1/5 = -21/5 = -42/10

-13 1/10 = -131/10

-42/10 -  -131/10=

-42/10 + 131/10 = 89/10 = 8 9/10

 answer is A

tatuchka [14]3 years ago
4 0
<span><span><span>−42</span>/10</span>+<span>131/10</span></span><span>=<span><span><span>−42</span>/10</span>+<span>131/10</span></span></span><span>=<span><span><span>−42</span>+131</span>/10</span></span><span>=<span>8910</span></span><span>(Decimal: 8.9)</span>Answer: A
You might be interested in
I NEED HELP ASAP!!! I'LL GIVE BRAINLIEST FOR THE CORRECT ANSWER!!!
ASHA 777 [7]

Answer:

-x 7

Step-by-step explanation:

6 0
3 years ago
You purchase a stereo system for $830. The value of the stereo system decreases 13% each year. a. Write an exponential decay mod
lorasvet [3.4K]

Answer:

a. y=830*(0.87)^x

b. The value of stereo system after 2 years will be $628.23.

c. After approximately 4.98 years the stereo will be worth half the original value.

Step-by-step explanation:

Let x be the number of years.

We have been given that you purchased a stereo system for $830. The value of the stereo system decreases 13% each year.

a. Since we know that an exponential function is in form: y=a*b^x, where,

a = Initial value,

b = For decay b is in form (1-r), where r is rate in decimal form.

Let us convert our given rate in decimal form.

13\%=\frac{13}{100}=0.13

Upon substituting our given values in exponential decay function we will get

y=830*(1-0.13)^x

y=830*(0.87)^x

Therefore, the exponential model y=830*(0.87)^x represents the value of the stereo system in terms of the number of years since the purchase.

b. To find the value of stereo system after 2 years we will substitute x=2 in our model.

y=830*(0.87)^2

y=830*0.7569

y=628.227\approx 628.23

Therefore, the value of stereo system after 2 years will be $628.23.

c. The half of the original price will be \frac{830}{2}=415.

Let us substitute y=415 in our model to find the time it will take the stereo to be worth half the original value.

415=830*(0.87)^x

Upon dividing both sides of our equation by 830 we will get,

\frac{415}{830}=\frac{830*(0.87)^x}{830}

0.5=0.87^x

Let us take natural log of both sides of our equation.

ln(0.5)=ln(0.87^x)

Using natural log property ln(a^b)=b*ln(a) we will get,

ln(0.5)=x*ln(0.87)

\frac{ln(0.5)}{ln(0.87)}=\frac{x*ln(0.87)}{ln(0.87)}

\frac{ln(0.5)}{ln(0.87)}=x

\frac{-0.6931471805599}{-0.139262067}=x

x=4.977286\approx 4.98

Therefore, after approximately 4.98 years the stereo will be worth half the original value.

5 0
3 years ago
For the first 8 months at his new job, James gets
Vikentia [17]

James receives a pay increase of 100% per month and has a starting salary of $500.

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more numbers and variables.

Let b represent the rate of pay increase and a represent the initial pay.

Let us assume that he had received 128000 after the 8 months. hence:

128000 = ab⁸   (1)

Also in the 10th month, he had received 512000, hence:

512000 = ab¹⁰    (2)

From the both equations:

a = 500, b = 2

rate of increase = 200% - 100% = 100%

James receives a pay increase of 100% per month and has a starting salary of $500.

Find out more on equation at: brainly.com/question/2972832

#SPJ1

4 0
2 years ago
What is the mean of 87 104 and 99
sveticcg [70]
It is 96.6 repeating. to get this answer, you add up all the numbers then divide the answer by hiw many numbers there are
6 0
3 years ago
Read 2 more answers
Five gal of water are added to a pool each minute.
fomenos

Simply divide 80 by 5. 5 goes into 80 16 times, and each 5 = one minuet, so it would take 16 minuets to fill the pool with 80 gallons.

5 0
3 years ago
Read 2 more answers
Other questions:
  • HELP PLEASEEEEEEEEEEEEEEEEEE
    15·2 answers
  • Someone help me I will mark you the brainiest
    12·1 answer
  • Find the smallest value of ''P'' that makes the numbers perfect square.
    9·1 answer
  • Guess the value of the limit (correct to six decimal places). (if an answer does not exist, enter dne.) lim hâ0 (4 + h)5 â 1024
    13·1 answer
  • Joey made 300 greeting cards. He sold 40% of the cards, gave 85% of the remaining cards to him friends, and kept the rest of the
    14·1 answer
  • FACTOR the following quadratic expression: x^2-3x-18. Clearly show your steps OR explain your reasoning and CHECK your answer by
    12·1 answer
  • A restaurant wants to study how well its salads sell. If 10 of the salads sold were ​salads, how many total salads did the resta
    15·2 answers
  • What is the answer for the second one?<br> 7% is the same as ??
    9·1 answer
  • Identify the type of figure
    10·2 answers
  • Solve for x and then find the length of each segment. The measure of segment is equal to the sum of its smaller parts
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!