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Helga [31]
3 years ago
15

deanna gets 3 problema incorrect on her math quiz. her score is 85%. how many questions are on the quiz

Mathematics
2 answers:
never [62]3 years ago
8 0
Let's start by seeing what percentage is incorrect.
100-85=15
So, 15% is incorrect when answering 3 problems wrong. So let's divide 15 by 3.
15÷3=5
So, each problem is worth 5%, let's divide 100 by 5. The reason I'm doing thiis is to find how many questions are on the quiz, since if you got them all right, it's 100.
100÷5
20
There are 20 questions, let's make sure this is correct.
If she got 3 wrong, she got 17 right. Let's calculate her percentage and make sure it is the right one.
17÷20
.85×100
85%
So, there are 20 questions on the math quiz.
earnstyle [38]3 years ago
3 0
Alright, So Usually, The Highest Score You Can Get On A Quiz Or Homework Sheet Is 100%. Let’s Assume The Best Score You Can Get Is 100%.

100 (Highest Score) - 85 (Score) = 15

15 Divided By 3 = 5

So, Each Problem That You Got Correct You Earned 5 Points.

Then, You Can Do 100 Divided By 5, Which Equals 20.

There Was 3 Problems Incorrect, So 20 - 3 = 17.

Then, 17 Divided By 20 = 0.85, Which Equals 85%.

Therefore, There Were 20 Questions On The Quiz.
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2 years ago
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belka [17]

Answer:

I am not the best in this type of math, the best thing I can do is help you.

You see that there is a pattern in the chart? X adds 2 every column, and Y adds 4 every column.

I believe the slope simplified is 2/1, if you are following y/x. If not, then the other way around.  

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6 0
3 years ago
A car dealer offers a discount of 15% off the normal price of a car for cash.
motikmotik

Answer:

7200

Step-by-step explanation:

100/(100-15) * 6120 = 7200

6 0
3 years ago
The Petri dish shown has no lid. What is the surface area of the outside of the Petri dish? Round to the nearest tenth. A cylind
Bess [88]

Answer:

12566.4 mm²

Step-by-step explanation:

The Petri dish shown has no lid. What is the surface area of the outside of the Petri dish? Round to the nearest tenth. A cylindrical-shaped Petri dish with a radius of 50 millimeters and a height of 15 millimeters.

TSA = Total Surface Area

CSA = Curved Surface Area

TSA of open cylinder = CSA of cylinder + area of base or top

= 2πrh + πr²

= πr(2h + r)

From the above question:

r = 50mm

h = 15mm

Hence,

= π × 50 (2 × 15 + 50)

= π × 50 (30 + 50)

= π × 50(80)

= π × 4000

= 12566.370614mm²

Approximately = 12566.4 mm²

The Surface Area of the petri dish with no lid = 12566.4 mm²

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A regular polygon has possible angles of rotational symmetry of 20°, 40°, and 80°. How many sides does the polygon have?
liq [111]
The answers 18 sides.
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3 years ago
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