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
Gre4nikov [31]
3 years ago
15

In a certain game, a player can solve easy or hard puzzles. A player earns 30 points for solving an easy puzzle and 60 points fo

r solving a hard puzzle. Tina solved a total of 50 puzzles playing this game, earning 1,950 points in all. How many hard puzzles did Tina solve?10
15
25
35
Mathematics
1 answer:
Aleksandr-060686 [28]3 years ago
6 0

Answer:  Second option.

Step-by-step explanation:

Let be "e" the number of easy puzzles Tina solved and "h"  the number of hard puzzles Tina solved.

Set up a system of equations:

\left \{ {{e+h=50} \atop {30e+60h=1,950 }} \right.

You can use the Eliminationn Method to solve this system of equations:

  • Multiply the first equation by -30.
  • Add the equations.
  • Solve for "h".

Therefore, through this proccedure, you get:

\left \{ {-30e-30h=-1,500} \atop {30e+60h=1,950 }} \right.\\.........................\\30h=450\\\\h=\frac{450}{30} \\\\h=15

You might be interested in
Find diameter of a circle with a circumference of 17 inches
Debora [2.8K]

Answer:

5.41127

Step-by-step explanation:

The formula we use is d=c/π.

3 0
3 years ago
The table shows how Emily’s essay will be scored. What was Emily’s overall score?
DiKsa [7]
Is there a table? Can you attach a picture of it?
8 0
3 years ago
A credit card had an APR of 17.84% all of last year and compounded interest daily. What was the credit card's effective interest
Andreas93 [3]
The solution to the problem is as follows:

<span>((1+.1784/365)^365) - 1 =.1953=19.53%
</span>
Therefore, best and most correct answer among the choices provided by your question is the fourth choice or letter D. 19.53%

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
3 0
3 years ago
Read 2 more answers
Oliver wants to run at least 30 miles this week she has already run 14 miles by Tuesday how many miles does she need to run each
Olin [163]

Answer:

If she wants to run 16 more miles in four days (30 miles minus already done 14 miles) she can run  4 miles a day for the next four days. 4 miles a day.

Step-by-step explanation:

3 0
3 years ago
10kg 20kg 24kg ?kg plz answer this for me
luda_lava [24]

Answer:

27KG

Step-by-step explanation:

Mouse- M , Cat - C, Dog - D

M + C = 10 ----- (1)

M + D = 20 -------(2)

C + D = 24 --------(3)

(1) - (2) => C - D = -10 ---- (4)

(3) + (4) => 2C = 14

                => C = 7

Substitute C in (1)  => M + 7 = 10

                            => M = 3

Substitute M in (2) => 3 + D = 20

                            => D = 17

Therefore C + M + D = 7 + 3 + 17 = 27KG

3 0
2 years ago
Other questions:
  • What does e^pi equal to
    10·1 answer
  • X (year)| y ($ in billions)
    7·1 answer
  • What type of polynomial is: 2x - 4x<br> - 7+ 6x2
    7·1 answer
  • Does anybody know the awnser to w=7a+4b
    9·1 answer
  • What does x and y equal
    15·1 answer
  • a. A 2017 poll found that 56​% of college students were very confident that their major will lead to a good job. If 15 college s
    5·1 answer
  • I need help please!! ​
    7·2 answers
  • What is 21 divided by 756?
    7·2 answers
  • PLEASE HELP !!!!!<br> LOOK AT THE Q BELLOW
    5·1 answer
  • How to factorize 5x^2-20y^2​
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!