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DENIUS [597]
2 years ago
7

In a class test containing 10 questions, 5 marks are awarded for every correct answer and (−2) marks are awarded for every incor

rect answer and 0 for questions not attempted.
Heena gets two correct and five incorrect answers out of seven questions she attempts. What is her score?
Mathematics
2 answers:
expeople1 [14]2 years ago
8 0

Answer:

Heena gets 2 correct and 5 incorrect. She attempts only 7 questions so for the remaining 3 questions she will score zero marks.

So total marks scored by Heena is 5×2−5×2+0  i.e 0marks

Step-by-step explanation:

e-lub [12.9K]2 years ago
4 0

Answer:

0 points

Step-by-step explanation:

So first we see that she gets 2 questions correct,

2 * 5 = 10

Then we see that she gets 5 questions wrong,

5 * -2 = -10

Then we see that she doesn't attempt three questions,

3 * 0 = 0;

Now we add up the points,

10 - 10 + 0 = 0 points

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80 percent of 90 is the same as 40 percent of what number?
Nadya [2.5K]

    80% of 90 may be found by multiply 90 by 0.8. Once you have that number, you can use it to set up a proportion with 2/5 (the simplified form of 40/100). Thus, you will write out 72/x = 2/5, since x is the number that you're solving for. Multiply numerators and denominators of opposite fractions to get the equation 72(5) = 2x. Finally, simplify 360 = 2x by dividing both sides by 2 to isolate the variable. You should have your answer by now.

5 0
2 years ago
Read 2 more answers
Diego has $500 in his savings account. each month, he takes out $20 to pay for karate class.
lyudmila [28]

Answer:

25m?

Step-by-step explanation:

I mean I'm not sure what the question is asking for but after 25 months he won't have any money left lol hope that helped ♡

7 0
2 years ago
The revenue of Apple® went from $54.5 billion in 2013 to $74.6 billion1 in 2015. Find an exponential function to model the reven
Rus_ich [418]

r = continuous growth rate

revenue t years after 2013 = 54.5×10⁹×e^(rt)

74.6×10⁹ = 54.5×10⁹×e^(2r)

e^(2r) = 74.6/54.5

2r = ln(74.6/54.5)

r = ½ln(74.6/54.5) ≅ 0.15697 = 15.697% per year

Hope this helps!

6 0
2 years ago
A study was conducted to determine the percent of children that want to grow up work in the same career as a parent. In a sample
Irina-Kira [14]

Answer:

Step-by-step explanation:

From the information given,

Number of sample, n = 200

Probability of success, p = 43/100 = 0.43

q = 1 - p = 1 - 0.43

q = 0.57

For a confidence level of 95%, the corresponding z value is 1.96.

The formula for determining the error bound for the proportion is

z × √pq/n

= 1.96 ×√(0.43 × 0.57)/200

= 1.96 × 0.035 = 0.0686

The upper boundary of the population proportion is

0.43 + 0.0686 = 0.5

The lower boundary of the population proportion is

0.43 - 0.0686 = 0.4

The error in the solution is

phat = 0.43/200 = 0.00215

Also,

[-0.0043, 0.0086] is wrong

5 0
2 years ago
Sphere A has a radius of 24 centimeters, and sphere B has a diameter of 42 centimeters. The radius of sphere A is multiplied by
Vera_Pavlovna [14]

The correct answer is:

B. \frac{7}{8}

The radius of sphere A is multiplied by \frac{7}{8} to produce the radius of sphere B.

|Huntrw6|

3 0
2 years ago
Read 2 more answers
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