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
kodGreya [7K]
3 years ago
15

adam spent 13.10 on supplies for school. book covers cost 1.50 and boxes of mechanical pencils were each 2.80. if he bought seve

n items total, then how many of each did he buy
Mathematics
1 answer:
Flauer [41]3 years ago
7 0
<h3>Answer:</h3>

5 book covers and 2 boxes of pencils

<h3>Step-by-step explanation:</h3>

If all 7 were book covers, the cost would be 10.50. The cost is 2.60 more than that. Each box of mechanical pencils costs 1.30 more than a book cover, so there must be 2.60/1.30 = 2 boxes of mechanical pencils (and 5 book covers).

_____

If you want an equation, let p represent the number of pencil boxes. Then 7-p is the number of book covers.

... 1.50(7-p) +2.80p = 13.10

... 1.30p = 13.10 -10.50 . . . . . subtract 10.50, collect terms

... p = 2.60/1.30 = 2 . . . . pencil boxes

... 7-2 = 5 . . . . . book covers

You might be interested in
Harrison has 90 CDS in his music collection. If 40% of those CDS are country music and 50% are pop, how many CDS are other types
Ksenya-84 [330]
10% CDS are other types of music
4 0
3 years ago
Approximately how many people make between $30,000 and $66,000​
Alja [10]

Answer:

approximately 1 to 7.674 billion people

Step-by-step explanation:

cause theres 7.674 billion peepsin the world

8 0
2 years ago
Hyun Woo is riding a ferris wheel. H t H(t) models his height (in m m) above the ground, t t seconds after the ride starts. Here
worty [1.4K]

Answer:

<u></u>

  • <u>53 seconds.</u>

Explanation:

The text and the model are garbled.

This is the question amended:

<em />

<em>Hyun Woo is riding a ferris wheel. H(t) models his height (in m) above the ground, t seconds after the ride starts. Here, t is entered in radians.</em>

<em>H(t) = -10 cos(2π/150 t)+10</em>

<em />

<em>When does Hyun Woo first reach a height of 16 m?</em>

<em />

<h2>Solution</h2>

<em />

When <em>Hyun Woo reaches a height of 16 m</em> the <em>model </em>states:

  • <em>16 = -10 cos(2π/150 t)+10</em>

<em />

Then you must find the lowest positive value of t that is a solution of the equation.

Solve the equation:

  • <em>16 = -10 cos(2π/150 t)+10</em>

  • 10cos(2π/150 t) = - 6

  • cos(2π/150t) = -0.6

  • 2π/150t = arccos(-0.6)

  • 2π/150t = 2.214297

  • t = 52.86s ≈ 53 s ← answer
4 0
3 years ago
Question 6 of 10
ElenaW [278]

150,000

This is the answer for apex!!!

6 0
3 years ago
Read 2 more answers
I would be very grateful if someone helps ​
stiks02 [169]

Answer:Addition

Step-by-step explanation:

and the answer for the addition is 34135

5 0
2 years ago
Read 2 more answers
Other questions:
  • How do you solve 40,078-18,537?
    13·2 answers
  • Each classmates contributes $2 for charity Write an expression for the amount of money raised by your class
    10·2 answers
  • Hi can someone plz help me with this question
    15·1 answer
  • You take your car in for repairs. The service station charges $200 for parts plus $50 per hour for labor. What is the equation t
    9·1 answer
  • What does 64/100 represent as a ratio and a percent
    11·1 answer
  • What is the most reasonable estimate for the measure of the angle
    15·2 answers
  • W
    14·1 answer
  • Write the expression in exponential form.<br> (find a and b)
    13·1 answer
  • Atul, Bryony and Charlotte share an amount of money in the ratio 4:11:10
    9·1 answer
  • Find the missing value. 8-?=-5 HELPPP!
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!