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m_a_m_a [10]
3 years ago
11

A teacher gave a test with 50 questions, each worth the same number of points donovan got 39 out of 50 questions right Marci's s

core was 10 percentage points higher what was Marci's score
Mathematics
1 answer:
IrinaK [193]3 years ago
3 0
To figure this out, you have to figure out what Donovan scored.
Just divide his score (39 ÷ 50) and get 0.78.

Since we already knew this, we can figure out Marci's score. Since she score 88%, we can assume she scored somewhere in the 40's.
Once you figure out what her score was out of 50, divide it.

Your equation should look like this: 44 ÷ 50 = 0.88

This means that Marci answered 44 questions out of 50 questions correctly. (44/50)
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PLEASE HELP!!
madam [21]

Answer:

k=2/3

Step-by-step explanation:

Step 1:

Step 1 in solving the exponential equations is re-writing the base same as other side of the equation

so,

25^{3k}=625\\=> 25^{3k}=25^2

Step 2:

Second step is equating the exponents

The rule used is:

If\ B^m=B^n\ then\ m=n

So in this case

3k=2\\k = \frac{2}{3}

So the solution is:

k=2/3 ..

3 0
3 years ago
A publisher reports that 54% of their readers own a particular make of car. A marketing executive wants to test the claim that t
dalvyx [7]

Answer and explanation:

Null hypothesis: p is not 54%

Alternative hypothesis : p is equal 54%

First find standard deviation

Standard deviation is:

σ = √[ P ( 1 - P ) / n ] = √[ 0.54×0.46/220 ] =0.033

The z score is calculated p-P/σ = (0.54-0.50)/0.033 = 1.2121

Therefore we can conclude that proportions are not same and fail to reject the null hypothesis

3 0
3 years ago
Which inequality is a true statement?
max2010maxim [7]

Answer:

The true answer is " -3 < -1.

Step-by-step explanation:

I say this because these numbers are negatives. If you put them on a number line you can see that the bigger numbers are farther from the postitives. Postitive numbers are bigger so whatever is close to them is bigger. So because (-1) is closer to them it would be greater, which is what the symbol "<' states.

7 0
3 years ago
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Westkost [7]

1/28. The probability that both songs are rock songs is 1/28.

The easiest way to solve this problem is using probability.

This is a example of probability without replacement, using the probability property of P(A∩B) = P(A)*P(B).

The probability of choose a rock song is P(A) = 2/8, and the probability to choose the second song from the 7 songs remaining and be rock song assuming that the first song that she picked was rock song is P(B) = 1/7.

The probability that both songs are rock song is:

P(A∩B) = P(A)*P(B)

P(A∩B) = (2/8)(1/7) = 2/56

P(A∩B) = 1/28

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bixtya [17]

Answer:

The answer is i think -12*2

Step-by-step explanation:

6 0
3 years ago
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