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Radda [10]
3 years ago
14

Marna is playing a game where you score -5 points each time you guess the correct answer. The goal is to get the lowest score. T

o win the game, Marna must have a score less than -80 points. How many correct answers does Marna need to win the game?
Mathematics
2 answers:
grigory [225]3 years ago
4 0

Answer:

<h2>She needs 17 correct answers.</h2>

Step-by-step explanation:

Givens

  • You score -5 points each time you guess the correct answer.
  • Marna must have a score less than -80 points to win.

Now, let's be x the total number of correct answers. If you score -5 points per correct answer, that means -5x.

So, we know that Marna must score LESS THAN -80 points, that can be expressed as

-5x=-80\\x=16

Therefore, Marna need 17 correct answer to win the game. Remember that she needs less than -80 points, so with 16 answer she's gonna get barely -80, which is not enough to win the game.

Assoli18 [71]3 years ago
3 0

Answer:

Marna needs to answer correctly 17 times.

Step-by-step explanation:

-5 * 17 = -85, anything lower won't work.

You might be interested in
Find the 7 term of the Gb 2 , -6 , 18
Maslowich

Answer:

<h3>The 7th term is 1458</h3>

Step-by-step explanation:

For a geometric sequence

U(n) = ar^n - 1

Where

n is the number of terms

r is the common ratio

a is the first term

From the sequence

a = 2

r = - 6 /2 = -3

U(n) = 2(-3) ^ n - 1

For the 7th term

U(7) = 2(-3) ^ 7 - 1

= 2(-3)^6

The final answer is

= 1458

Hope this helps you

3 0
3 years ago
What is the simplified expression
Nady [450]

Answer:

7y - 4x

Step-by-step explanation:

Given

- 3(2x - y) + 2y + 2(x + y) ← distribute both parenthesis

= - 6x + 3y + 2y + 2x + 2y ← collect like terms

= - 4x + 7y

= 7y - 4x

4 0
3 years ago
To bike rental companies have different pricing systems company a charges a flat fee of four dollars +2 dollars per mile Company
lukranit [14]

Answer: the charge would be the same after 5 miles

Step-by-step explanation:

Let x represent the distance at which both companies charge the same amount.

company A charges a flat fee of four dollars plus 2 dollars per mile. It means that the total charge for x miles would be

4 + 2x

Company B does not charge a flat fee but charges $2.80 per mile driven. It means that the total charge for x miles would be 2.8x.

For the charge to be the same, the number of miles would be

2.8x = 4 + 2x

2.8x - 2x = 4

0.8x = 4

x = 4/0.8

x = 5

5 0
3 years ago
Joey and Armando live on the same st as the park. The park is 9/10 mile from Joey's home. Joey leaves home and walks to Armando'
AleksandrR [38]
Let's start by assuming Armando's house is between Joey's and the park. 

Let x be the distance Joey walked to Armando's house.

<span>The park is 9/10 mile from Joey's home. Joey leaves home and walks to Armando's home. Then Joey and Armando walk 3/5 mile to the park. 

</span>\dfrac{9}{10} = x + \dfrac{3}{5}

x = \dfrac{9}{10} - \dfrac{3}{5} = \dfrac{9}{10} -\dfrac{6}{10} = \dfrac{3}{10}

That's probably the answer they're looking for.  But what if the park is between Joey and Armando's houses or Joey is between the park and Armando?  (The latter isn't really possible with the given distances.)

Let a, b, c be the distances between three collinear points like we have here.  Our equation is really a few equations in one, something like

\pm a \pm b = \pm c

Let's get rid of the plus/minuses. Squaring,

a^2 + b^2\pm 2ab = c^2

\pm 2ab = c^2-a^2-b^2

4a^2b^2 = (c^2-a^2-b^2)^2

For us, that's a quadratic equation for c^2

4(9/10)^2(3/5)^2= (c^2-(9/10)^2 - (3/5)^2)^2

I'll skip right to the solutions,

c^2=\dfrac{9}{100} \textrm{ or } c^2=\dfrac{9}{4}


c=\dfrac{3}{10} \textrm{ or } c=\dfrac{3}{2}

We could have gotten the 3/2 just by adding 9/10+3/5 but this was more fun.

6 0
3 years ago
If 12 key chains cost $35.35, what is the cost of 20 key chains
alina1380 [7]

Answer:

The key chain's are 0.75 each

Step-by-step explanation:

3 0
2 years ago
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