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
lukranit [14]
3 years ago
7

What value of r makes this equation true? justify your solution. 0.4r - 7 = -.3r +2.8

Mathematics
2 answers:
Georgia [21]3 years ago
6 0

Answer:

all work is pictured and shown

fiasKO [112]3 years ago
3 0

The answer is 14

0.4r-7=-.3r+2.8

Add 7 to both sides. -7+7=0 so it cancels on the left. 2.8+7=9.8.

0.4r=-.3r+9.8.

Add .3r to both sides. -.3r+3r=0 so it cancels on the right. 0.4r+.3r=0.7r.

0.7r=9.8

Divide 0.7 to both sides. 9.8 divided by 0.7 = 14

So r=14

You might be interested in
N a recent election, Mark Benton received 780 votes for 12% of the total vote. How many people voted in the election?
Sloan [31]

Answer: Answer C

Step-by-step explanation:

12%___780 votes

100%___X= 6500 votes

(100*780)/12 = 6500

5 0
3 years ago
Suppose the number of messages that an inbox receives may be modeled by a Poisson distribution. If the average number of message
docker41 [41]

Answer:

0.36427

Step-by-step explanation:

Mean = λ = 18 messages per hour

P(X = x) = (e^-λ)(λ⁻ˣ)/x!

P(X ≤ x) = Σ (e^-λ)(λ⁻ˣ)/x! (Summation From 0 to x)

But the probability required is that the messages thay come in an hour is between 15 and 20, that is, P(15 < X < 20)

P(15 < X < 20) = P(X < 20) - P(X ≤ 15)

These probabilities will be evaluated using a cumulative frequency calculator.

P(X < 20) = 0.65092

P(X ≤ 15) = poissoncdf(18, 15) = 0.28665

P(15 < X < 20) = P(X < 20) - P(X ≤ 15) = 0.65092 - 0.28665 = 0.36427.

You can use the Poisson distribution calculator here

https://stattrek.com/online-calculator/poisson.aspx

4 0
3 years ago
<img src="https://tex.z-dn.net/?f=8%20%5E%28x%29%2B32%20x%5E%7B2%7D%2B4" id="TexFormula1" title="8 ^(x)+32 x^{2}+4" alt="8 ^(x)+
Grace [21]

Answer:

Step-by-step explanation:

Rearrange the terms and take out a common factor of 4

4(8x^2 + 2x + 1)

I think this is as far down as you want to take it. It gives an imaginary root which you may not be familiar with.

4 0
3 years ago
Eric has $25 to purchase magazines and to pay for his lunch. Each
faust18 [17]

Answer:

B

Step-by-step explanation:

The maximum amount Eric can spend on magazines is $25 less the cost of lunch, $15.

The appropriate inequality sign would be less than since he cannot spend more than $25.

Also, the amount he can spend on magazines would be what is left after paying for lunch.

So the correct inequality is 4m - 15 < 25

8 0
3 years ago
Which of the following expressions represents the solution to x – 3 &gt; -4?
Bess [88]

Step-by-step explanation:

x - 3 > -4

= x > -4+3

= x > -1 _ Answer

8 0
3 years ago
Other questions:
  • Lee is thinking of 2 numbers, the product is 18.the quotient is 2. what are yhe two numbers?
    13·1 answer
  • Quadrilateral QRST is a square. If the measure of angle RQT is 3x - 6. Find the value of x.
    12·1 answer
  • tim earns $150/week plus $15.00 for each desk he assembles. Write an inequality to represent how many desks he needs assemble to
    10·1 answer
  • How many times would you expect the result to be a number less than 6
    5·2 answers
  • Explain how to find the exact value of cot 5pi/3 , including quadrant location.
    12·1 answer
  • What is this and how do i solve
    9·1 answer
  • What’s the equation for a line with a x-intercept of -5 and y-intercept of 7
    12·1 answer
  • Given g(x)=-2x+2, solve for x when g(x)=8
    13·2 answers
  • Is 1.30 bigger than 1.3?
    12·1 answer
  • Please help! I need to tell whether x and y are in a proportional relationship and I need to write an equation that represents t
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!