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
The Royals softball team played 75 games and won 60 of them. What percent of the games did they lose?
denis23 [38]

Answer:

0.2 or 20%

Step-by-step explanation:

60/75=0.8

15/75=0.2

5 0
3 years ago
What is 399713 rounded to the place value of the underlined digit
Anna [14]
The thousands place is the 9 in 399,713. 7 is closer to 10 than to 0, therefore, you roundup, increasing the thousands place by one. Carry the 0 to the next 9 in the ten thousands place, and again to the hundred thousands, adding one to the 3. Therefore the answer is 400,000.

Hope This Helps!
4 0
3 years ago
A circle has a center located at 2 5 and passes through the point 10 3 answer
nikklg [1K]

Answer:Explanation: The formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. If a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.

Step-by-step explanation:

4 0
3 years ago
Melissa used her credit card to buy a $745 refrigerator. She kept the refrigerator for exactly nine years, during which time it
NemiM [27]

Answer:

37.77

Step-by-step explanation:

P= PV x i / 1- (1+i)^-n

PV = 745

I = .1684 / 12 = .01403

N = 4 x 12 = 48

.19 x (365 x 9) = 624.53

21.4338469 x 48= 1028.12

624.53 / (624.53+1028.12) = 37.77

5 0
3 years ago
HELP ME PLS ILL MARK AS BRAINLESS
faltersainse [42]

Answer:

A: 12:18

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
Other questions:
  • Add the two expressions
    8·1 answer
  • What’s the answer to this?
    7·1 answer
  • 2 1/2 and 1/2 are reciprocals. True or false?
    14·1 answer
  • What is 4/5 of 1/4 of 40
    10·2 answers
  • How do you do this 10 8/9+ 2 5/8+ 16 2/9+ 5 7/8=
    9·2 answers
  • In what quadrant would the ordered pair (-8,-2) be in??
    12·1 answer
  • The point plotted on the number line is What is the approximate value of x? 04 O 9 O 17 O 20​
    12·1 answer
  • Can someone help me pls
    9·2 answers
  • Work out 50 as a percentage of 10<br> 5%<br> A<br> 20%<br> B<br> 400%<br> C<br> 500%<br> D
    13·2 answers
  • How many more pumpkins have a mass between 999 and 121212 \text{kg}kgstart text, k, g, end text than between 000 and 333 \text{k
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!