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Mkey [24]
3 years ago
14

On a quiz, students were awarded a certain number of points for a correct answer and penalized a certain number of points for an

incorrect answer. If a student answered all the questions on the quiz and had c correct answers, her score on the quiz was 25c – 10(15 – c). How many questions were on the quiz?
Mathematics
1 answer:
SVETLANKA909090 [29]3 years ago
8 0
Given that the score of the student on the quiz was 25c - 10(15 - c)

It can be seen that the first term of expression for her score (i.e. 25c) shows that 25 marks were awarded to each correct answer.

The second term of the expression (i.e. 10(15 - c)) represent that 10 marks were deducted from each wrong answer.

Thus, the number of wrong answers is 15 - c.

The sum of the correct answers and the wrong answers gives the total number of questions in the quiz.

Thus, the total number of questions in the quiz is given by 15 - c + c = 15.

Therefore, there are 15 questions in the quiz.
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Jack broke apart 5x216 as (5x200)+(5x16) to multiply mentally. What strategy did Jack use?
Sveta_85 [38]

For this case we have the following multiplication:

5 * 216

We can rewrite this multiplication in the following way:

5 * (200 + 16)

From here, we apply the distributive property.

We have then:

(5 * 200) + (5 * 16)

Therefore, Jack's strategy is:

Write the number in an expanded form and then apply the distributive property.

Answer:

Jack's strategy is:

Write the number in an expanded form and then apply the distributive property.

8 0
3 years ago
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A jar contains 6 yellow marbles, 4 black marbles, and 2 purple marbles. Two marbles are picked at random, without replacement. W
ludmilkaskok [199]

Answer:

The probability of selecting both yellow is 5/22.

Step-by-step explanation:

Given the number of yellow marbles = 6

Black marbles = 4

Purple marble = 2

Now find the total number of marbles in the jar.

Thus total marbles = Yellow marbles + Black marbles  + Purples marble

Now insert the values in the above formula.

Total marbles = 6 + 4 + 2

Total marbles = 12

The probability of 2 yellow marble:

= \frac{6}{12} \times \frac{5}{11} \\= \frac{5}{22}

Thus, the probability of selecting both yellow is 5/22.

3 0
3 years ago
Find 15 percent of 15 percent of 15 percent of 500 how does this compare to finding 45 percent of 500?
4vir4ik [10]
Completely different...

.15*.15*.15*500

500(.15^3)=1.6875

500(.45)=225
4 0
2 years ago
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Is non-traditional musical notation, like a body percussion composition, considered music?
kykrilka [37]

Answer:

Music is an art form that means individuals can consider what is music to them.

Music in the dictionary describes music as any sound or voice that produces beauty or form. What shapes body percussion in any percussion would be therefore its form or beauty, to be considered music.

If it fails to provide that quality then it is just considered sound or at best notation to music like a short sound can provide would also be notation to music.

5 0
3 years ago
What is............What is 60% of 1200
butalik [34]

Answer: 720

<u>Multiply</u>

60%×1200=720

Note: When finding the percent of a number always multiply the percent times the number.

5 0
3 years ago
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