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3 years ago

Which polynomial is equal to (x + 1)(2x + 1)

Mathematics

2 answers:

VladimirAG [237]3 years ago

6 0

Answer:

2x^2+3x+1

Step-by-step explanation:

FOIL

tiny-mole [99]3 years ago

4 0

Answer:

2x^2+3x+1, I believe.

Step-by-step explanation:

Multipy 'em

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In a restaurant 72 out of 108 tables are booths. What is the ratio of tables that are booths to the total number of tables.

denpristay [2]

Answer:

The ratio of tables that are booths to the total number of tables = $\frac{72}{108}$

Step-by-step explanation:

The number of tables in a restaurant, p = 108

The number of table that are booths, q = 72

Then, the ratio of tables that are booths to the total numbers of tables = $\frac{q}{p}$

= $\frac{72}{108}$

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3 years ago

This net will be folded to form a solid.

emmasim [6.3K]

Answer:

2,5, and 6

Step-by-step explanation:

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3 years ago

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Scores from an exam are normally distributed with a mean of 85 and a standard deviation of 5. Suppose 188 students take the exam

charle [14.2K]

The mean is $\mu=85$ and standard deviation is $\sigma=5$ . Then the variable $X\sim N(85,5)$ .

Use substitution $Z=\dfrac{X-\mu}{\sigma}=\dfrac{X-85}{5}$ , then the variable $Z\sim N(0,1)$ .

The probability $Pr(X>80)$ can be calculated in the following way:

for X=80, $Z=\dfrac{80-85}{5} =-1$ and $Pr(X>80)=Pr(Z>-1)$ . From the diagram $Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84$ .

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

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3 years ago

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What set does 30 belong to

docker41 [41]

Answer:

30 belongs to the set of real numbers, the set of rational numbers, the set of whole numbers, the set of natural numbers and the set of integers.

Step-by-step explanation:

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2 years ago

Find the percent of increase.<br> Original number: 45 books<br> New number: 63 books

BARSIC [14]

Answer:

Step-by-step explanation:

first you multiply 45 by .40 you multiply by .40 because that is the percent increase.

45*.40=18

then you just add the 18 to 45 which get you 63.

answer:40%

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3 years ago