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
Karo-lina-s [1.5K]
3 years ago
15

A tennis player keeps track of the number of successful first serves he makes. During the first 8 service points of a game, only

2 of his first serves are playable, so his first serve percentage is 25%. How many more consecutive successful first serves must he have to raise his first serve percentage to 60%?
Mathematics
1 answer:
Andru [333]3 years ago
5 0

Answer:

He needs 7 more consecutive successful first serves to raise his first serve percentage to 60%.

Step-by-step explanation:

After n consecutive serves, his total number of serves is going to be n+8, since he has already served 8 times. In the best case, his number of successful first serves is n+2.

His percentage of succesful first serves is the division of the number of succesful first serves divided by the total number of serves. So

P = \frac{n+2}{n+8}

We want P = 0.60. So

0.6 = \frac{n+2}{n+8}

n+2 = 0.6*(n+8)

n + 2 = 0.6n + 4.8

n - 0.6n = 4.8 - 2

0.4n = 2.8

n = \frac{2.8}{0.4}

n = 7

He needs 7 more consecutive successful first serves to raise his first serve percentage to 60%.

You might be interested in
Find the area of the shaded region.
muminat

Answer:

It's 38.1

Step-by-step explanation:

I'm not the best at explaining these type of things but I hope this helps you out

5 0
2 years ago
a company will clean jarrel carpets for a total of $71 jarrel has a coupon for 20% of the total how much will jarrel save when h
Firdavs [7]

Answer: 14.2 I hope im Right but it’s a simple question

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
What's the better buy: A) 5lb. bag of potatoes for $3.79 or a 2lb. bag<br> for $1.50?
Tcecarenko [31]

Answer:

A 2lb. bag because 1.50 x 2 = 3.00$ plus the extra 1 lb which is 75c = 3.75 $

Step-by-step explanation:

Could i have branliest and heart please

8 0
3 years ago
ASAP HELP!!! use the quadratic regression feature of a graphing calculator to find a quadratic model. round to the nearest thous
seropon [69]

Answer:

y = 0.008x^2 + 0.518x + 131.886

Step-by-step explanation:

  1. Make sure your Plot 1 is ON. Select the Scatter Plots and the appropriate lists.
  2. Clear all functions in [Y=]
  3. Input data in L1 and L2. Go to [Stat] [Enter] to input data.
  4. Graph data points. ...
  5. Choose a regression from the list in [Stat] "CALC". ...
  6. Go to [ZOOM] "9: ZoomSTat" to view the data with the regression curve.

(credit: CPM Educational Program)

3 0
3 years ago
Determine the Unit Rate.
Lisa [10]

Answer: D-$2.50

Step-by-step explanation: 15 divided by 6 is 2.5

8 0
3 years ago
Read 2 more answers
Other questions:
  • Please help with this page
    14·2 answers
  • Please answer this correctly
    9·1 answer
  • Need help on answering 20.
    6·1 answer
  • Emily is saving up to buy a new phone. She already has $75 and can save an additional $7 per week using money from her after sch
    11·2 answers
  • Angle ABC is congruent to which angle?
    15·1 answer
  • Needddd helppp plzzzzz
    10·1 answer
  • Help me pls<br> Isbaksbaosbvshshs
    8·2 answers
  • One of the factor of x² +3x+2 is x+1 then the other factor is …..​
    14·1 answer
  • 9.
    15·2 answers
  • Express as an improper fraction 13 ⅔<br>​
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!