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
Ugo [173]
3 years ago
8

-28 + 10.r - 5.r = 42step my step explation​

Mathematics
2 answers:
Maksim231197 [3]3 years ago
6 0

Answer: r=14

Step-by-step explanation:

1) Move all terms to the left: -28+10r-5r-(42)=0

2) Add all the numbers together, and all the variables: 5r-70=0

3) Move all terms containing r to the left, all other terms to the right: 5r=70

r=70/5

r=14

Lelechka [254]3 years ago
3 0

Answer:

r = 14

Step-by-step explanation:

-28 + 10r - 5r = 42

<em>(</em><em>Subtract</em><em> </em><em>the</em><em> </em><em>like</em><em> </em><em>terms</em><em>,</em><em> </em><em>10r</em><em> </em><em>-</em><em> </em><em>5r</em><em>)</em>

-28 + 5r = 42

<em>(</em><em>Add</em><em> </em><em>+</em><em>2</em><em>8</em><em> </em><em>to</em><em> </em><em>each</em><em> </em><em>side</em><em>)</em>

+28 - 28 + 5r = 42 + 28

<em>(</em><em>Subtract</em><em> </em><em>like</em><em> </em><em>terms</em><em>,</em><em> </em><em>2</em><em>8</em><em> </em><em>-</em><em> </em><em>2</em><em>8</em><em> </em><em>and</em><em> </em><em>add</em><em> </em><em>terms</em><em> </em><em>4</em><em>2</em><em> </em><em>+</em><em> </em><em>2</em><em>8</em><em>)</em>

5r = 70

<em>(</em><em>Divide</em><em> </em><em>each</em><em> </em><em>side</em><em> </em><em>by</em><em> </em><em>/</em><em>5</em><em>)</em>

5/5r = 70/5

<em>(</em><em>Divide</em><em>)</em>

r = 14

You might be interested in
Does the Commutative Property of Addition apply when you add two negative integers?
MAVERICK [17]

The commutative property of addition means we can add two integers in any order. So yes, It would still apply to two negative integers (for example, -2 + -3 and -3 + -2 both equal five)

4 0
3 years ago
A website is offering a promotion, during which customers can buy up to 100 photos for a flat fee. The cost per photo varies inv
Alecsey [184]
The complete question in the attached figure

we have that
 for c=5 and n=20------------> n*c=20*5=100
 for c=2.5 and n=40------------> n*c=40*2.5=100
 for c=2 and n=50------------> n*c=50*2=100
 for c=1.25 and n=80------------> n*c=80*1.25=100

therefore
<span>the function that models the data is n*c=100
</span>
the answer is nc=100





6 0
3 years ago
Hey! A step by step explanation on this would be great! Thanks!<br> (25 Points)
kicyunya [14]

Step-by-step explanation:

We find the stationary point of (20 + 2x)(1200 - 60x),

where x is the unit rate of increase/decrease.

d/dx [(20 + 2x)(1200 - 60x)]

= d/dx (-120x² + 1200x + 24000)

= -240x + 1200.

When d/dx [(20 + 2x)(1200 - 60x)] = 0,

We have -240x + 1200 = 0. => x = 5.

Price per shirt that maximise revenue

= $20 + $2x = $20 + $2(5) = $30.

Maximum revenue

= (20 + 2(5))(1200 - 60(5))

= $30 * 900 = $27,000.

6 0
2 years ago
It is Flame's birthday today.
Lorico [155]
14 my teacher just told me the answer
6 0
3 years ago
Read 2 more answers
Please help me with this question
Nuetrik [128]

Answer:

false

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Other questions:
  • Write ‒6x^2 + 13x ‒ 6 as the product of two binomials.
    7·1 answer
  • How much money would need to be deposited into an account earning 5.75% interest compounded annually in order for the accumulate
    8·2 answers
  • Algebra 2. Grade 11
    14·1 answer
  • What is the equation of the line that passes through the point <br> (−3,5) and has a slope of -2?
    6·1 answer
  • Tim and Al are bricklayers. Tim can construct an outdoor grill in 5 days. If Al helps Tim, they can build it in only 3 days. How
    6·1 answer
  • 13. The lengths of two adjacent sides of a parallelogram are 7 cm and 5 cm respectively.
    12·1 answer
  • Need help ASAP !!!!!
    15·2 answers
  • A garden table and a bench cost $589 combined. The garden table costs $61 less than the bench. What is the cost of the bench?
    13·1 answer
  • Factories 5x+10 <br> Somebody please help
    11·1 answer
  • for each road condition, find the maximum speed the car can travel without needing more than 60m to stop. (rsm questions)
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!