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
goblinko [34]
3 years ago
7

Need help with this one as well I would be very grateful please need help !

Mathematics
1 answer:
hram777 [196]3 years ago
8 0
You are given two x and y pairs: (100,45) and (570,162.5)
First solve for the slope, m.

m = (162.5 - 45) / (570 - 100)
m = 117.5 / 470
m = 0.25

Not only is "m" the slope but it is the rate (dollars per minute) in the question. So it's 25 cents per minute to use the phone.
After imputing "m"  the linear equation looks like this:
y = 0.25x + b

Use either point as (x,y) to solve for the y-intercept "b". I'll use (100,45)

45 = 0.25(100) + b
45 = 25 + b
45 - 25 = b
20 = b

Not only is "b" the y-intercept but it is also always the flat fee added on to linearly increasing cost questions like this.

Final equation is:
y = 0.25x + 20

Part B.) If 939 minutes are used. Just put that in for x and solve for y.

y = 0.25(939) + 20
y = 234.75 + 20
y = 254.75

You might be interested in
0.7 (3s + 4)-1.1s = 7.9
vichka [17]

Answer:

s = 5.1

Step-by-step explanation:

0.7 (3s + 4)-1.1s = 7.9\\

Multiply both sides of the equation by 10

0.7\left(3s+4\right)\cdot \:10-1.1s\cdot \:10=7.9\cdot \:10\\\\= 7\left(3s+4\right)-11s=79\\

Expand

\mathrm{Expand\:}7\left(3s+4\right)-11s:\\\quad 10s+28

Subtract 28 from both sides

10s+28-28=79-28

Simplify

10s=51

Divide both sides of the equation by 10

\frac{10s}{10}=\frac{51}{10}

Simplify

s=\frac{51}{10}\\\\Decimal = 5.1

3 0
2 years ago
Read 2 more answers
The family car runs out of gas. You have to push it up the driveway into a service station. The ramp is 4 meters long and rises
Sophie [7]

Answer:

Step-by-step explanation:

slope, m = 0.1m/4m = 0.025

Theoretical effort (ignoring friction) = 9000N * 0.025 = 225 N

actual effort = 300 N

efficiency

= potential energy out / actual energy in

= 225 N / 300 N = 0.75

7 0
3 years ago
Classify each number below as a rational number or an irrational number.
artcher [175]

Answer:

-15pi = irrational

square root of -3 = irrational

square root of -4 = rational

-1/11 = rational

-27.92 repeated = rational

Step-by-step explanation:

7 0
2 years ago
Please help, I’m really confused
Alex17521 [72]

<u>Given</u>:

The given triangle is a right angled triangle.

The length of the hypotenuse is 17 units.

One of the legs of the triangle measure x units.

The one of the angles of the right triangle is 60°

We need to determine the value of x.

<u>Value of x:</u>

The value of x can be determined using the trigonometric ratio.

Thus, we have;

sin \ \theta=\frac{opp}{hyp}

Substituting \theta=60^{\circ}, opp=x and hyp=17 in the above formula, we get;

sin \ 60^{\circ}=\frac{x}{17}

Multiplying both sides of the equation by 17, we get;

sin \ 60^{\circ} \times 17=x

Simplifying, we get;

0.866 \times 17=x

Multiplying, we get;

14.722=x

Rounding off to the nearest tenth, we get;

14.7=x

Thus, the value of x is 14.7

5 0
3 years ago
Help me please. Best answer gets brainliest.
Lapatulllka [165]

Answer:

3 for problem

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • The sales tax on $350 is 22.75 find the sales tax rate
    15·1 answer
  • Which fractions are equievalent? a.20/5 b.-20/5 c.20/-5 d. -20/-5 e.- 20/5
    6·1 answer
  • Questions 2-7 will all be in regards to this data set:Observation X Y1 20 302 23 353 28 404 26 385 24 376 32 457 35 508 24 349 3
    12·1 answer
  • 2. The Soccer Club is selling T-shirts and washing cars to raise money for a summer trip. Last week, the club raised $292.50 by
    6·1 answer
  • If angle x and angle y form a linear pair then they are ______ (Congruent, Complementary, Supplementary) ???
    7·1 answer
  • John cut a paper square with a perimeter of 18 inches into two rectangles. The perimeter of one of the rectangles is 10 inches.
    12·2 answers
  • Plsss answerrrr I give brainliest thank uuu
    7·1 answer
  • Simplify 8n + 3 - 4 + 4n show work pls
    11·2 answers
  • A circle has a radius of 3. An arc in this circle has a central angle of 20°. What is the length of the arc? Either enter an exa
    14·1 answer
  • What is the range of ƒ(x) = |x|?<br><br> (–∞, 0)<br> (–∞, ∞)<br> (0, ∞)<br> [0, ∞)
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!