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Gnesinka [82]
3 years ago
6

Which expression is equivalent to 20?

Mathematics
2 answers:
DaniilM [7]3 years ago
8 0

Answer:

C. 4 X (3 + 8 – 6)

Step-by-step explanation:

3 + 8 = 11

11 - 6 = 5

5 x 4 = 20

Lynna [10]3 years ago
3 0

Answer:

C

Step-by-step explanation:

A

4x(3+8)-6

4х11-6

44-6

38-no

B

4x3+8-6

12+2

14-no

C

4х(3+8-6)

4х5

20-yes

D

(4x3)+(8-6)

12+2

14-no

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Answer:

i think c

Step-by-step explanation:

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3 0
3 years ago
30 points answer asap!!!!!!!!!!!!!!!!!!!!Which expression represents the lateral surface area of the cone?
Alisiya [41]

Answer:

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7 0
3 years ago
Whose class would you rather be in, if each teacher has different grading schemes?
Darina [25.2K]

Answer:

Mr. Winking 87.9%

Ms. Sand 88.55%

Ms. Sand's class is better

Step-by-step explanation:

Step 1: Average in Mr. Winking's Class 87.9%

Convert each weight factor to a decimal.

Homework 10% = 0.1

Quiz 25% = 0.25

Test 45% = 0.45

Exam 20% = 0.2

Multiply your grades by the weight factors:

Homework 0.1 X 95% = 9.5%

Quiz 0.25 X 85% = 21.25%

Test 0.45 X 87% = 39.15%

Exam 0.2 X 90% = 18%

Add all of these values:

9.5% + 21.25% + 39.15% + 18%

= 87.9%

Step 2: Average in Ms. Sand’s Class 88.55%

Convert each weight factor to a decimal.

Homework 15% = 0.15

Quiz 20% = 0.2

Test 40% = 0.4

Exam 25% = 0.25

Multiply the weight factors by your grades:

Homework 0.15 X 95% = 14.25

Quiz 0.2 X 85% = 17

Test 0.4 X 87% = 34.8

Exam 0.25 X 90% = 22.5

All all these values:

14.25 + 17 + 34.8 + 22.5

= 88.55%

Step 3:

I would rather be in Ms. Sand's class. My average in her class would be 88.55%, whereas in Mr.Winking's Class, my average would be 87.9%. 88.55% is a higher mark than 87.9% and I want higher marks. Therefore, I would get higher marks in Ms. Sand's class.

6 0
4 years ago
The mayor of a town has proposed a plan for the construction of an adjoining community. A political study took a sample of 900 v
Aleks04 [339]

Answer:

P-value = 0.0367

Step-by-step explanation:

This is a hypothesis test for a proportion.

The claim is that the percentage of residents who favor construction is significantly over 42%.

Then, the null and alternative hypothesis are:

H_0: \pi=0.42\\\\H_a:\pi>0.42

The sample has a size n=900.

The sample proportion is p=0.45.

 

The standard error of the proportion is:

\sigma_p=\sqrt{\dfrac{\pi(1-\pi)}{n}}=\sqrt{\dfrac{0.42*0.58}{900}}\\\\\\ \sigma_p=\sqrt{0.000271}=0.016

Then, we can calculate the z-statistic as:

z=\dfrac{p-\pi-0.5/n}{\sigma_p}=\dfrac{0.45-0.42-0.5/900}{0.016}=\dfrac{0.029}{0.016}=1.79

This test is a right-tailed test, so the P-value for this test is calculated as:

\text{P-value}=P(z>1.79)=0.0367

4 0
3 years ago
How to solve this problem?
OverLord2011 [107]
What happens when a quadratic function touches the x-axis only once?  It means that the quadratic function has only one real zero.  So which formula should we use? How about the almighty quadratic formula?

So when does the quadratic formula give you only one real zero? When the discriminant is equal to zero!

The discriminant is: b²-4ac

In our quadratic equation that means:
b = (3+m)
a = 4
c = 1

Thus, we need to solve: (3+m)²- 4*(4)*(1) = 0

m²+ 6m + 9 - 16 = 0
m² + 6m - 7 = 0
(m+7)(m-1) = 0
m = -7, 1

That's it! Plug back in and graph to see that it actually works!
6 0
4 years ago
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