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drek231 [11]
3 years ago
6

On a popular television quiz show, contestants gain points for getting questions correct, and lose points for getting the answer

incorrect. If Preston has 1250 points, which series of answers would cause his final score to be 1250 points?
A) one 200 point question correct, two 150 point questions correct, one 500 point question incorrect
B) two 200 point questions correct, two 150 point questions correct, one 500 point question incorrect
C) one 200 point question correct, two 150 point questions correct, and one 450 point question incorrect
D) three 50 point questions correct, two 75 point questions incorrect, and one 50 point question correc
Mathematics
2 answers:
xenn [34]3 years ago
5 0

Answer:

A

Step-by-step explanation:

200+150+150=500

500-500=0

Dmitriy789 [7]3 years ago
5 0

Answer:

A- one 200 point question correct, two 150 point questions correct, one 500 point question incorrect

Step-by-step explanation:

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A chef is going to use a mixture of two brands of Italian dressing. The first brand contains 7 vinegar, and the second brand con
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Answer:

78 ml of 7% vinegar and 312 ml of 12% vinegar.

Step-by-step explanation:

Let x represent ml of 7% vinegar brand and y represent ml of 12% vinegar brand.    

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x+y=390...(1)

y=390-x...(1)

We are also told that 1st brand 7% vinegar, so amount of vinegar in x ml would be 0.07x.

The second brand contains 12 vinegar, so amount of vinegar in y ml would be 0.12y.

We are also told that the chef wants to make 390 milliliters of a dressing that is 11% vinegar. We can represent this information in an equation as:

0.07x+0.12y=390(0.11)...(2)

Upon substituting equation (1) in equation (2), we will get:

0.07x+0.12(390-x)=390(0.11)

0.07x+46.8-0.12x=42.9

-0.05x+46.8=42.9

-0.05x+46.8-46.8=42.9-46.8

-0.05x=-3.9

\frac{-0.05x}{-0.05}=\frac{-3.9}{-0.05}

x=78

Therefore, the chef should use 78 ml of the brand that contains 7% vinegar.

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Step-by-step explanation:

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