Find the circumference of the circle. Use as an approximation for .

Find the value of 21 - 18 ÷ 3 · 2. 2 9 18

maks197457 [2]

Order of operations (PEMDAS):
21 - 18 / 3 * 2
let's add some parenthesese to make it easier to see:
21 - (18 / 3 * 2)
multiplication and division are associative
also: 18 / 3 = 18 * (1/3)
21 - (18 * (1/3) * 2)

21 - (6*2) or 21 - (36 * (1/3)) or 21 - (18 * (2/3))

21 - 12

9

8 0

3 years ago

Christopher surveyed 30 students about their favorite type of pet. The results are shown in the table.

MariettaO [177]

Answer:

well it will be 20 cuz 0 + 20 = 20

Step-by-step explanation:

skduamefmkaska

6 0

3 years ago

there are 24 sixth graders and 47th graders mr. Chan wants to divide both grades into groups of equal size with the greatest pos

Sedbober [7]

4 groups would be the answer

3 0

3 years ago

Read 2 more answers

Find the surface area of the composite figure. Round your answer to the nearest tenth if necessary.

Lera25 [3.4K]

The surface area of the composite figure is 444m².

Given a composite figure which is shown in the question.

The area of a shape (in square units) is the number of unit squares required to cover the entire area without gaps or overlaps. If a hologram has planes, those faces are called faces.

Firstly, we will find the area of front and end triangles by using the formula

Area=(1/2)×b×h and we will multiply this area by 2 because we are finding the area of two same triangles.

Here, h=6 and b=16 and substitute these values in the formula, we get

A₁=2×(1/2)×16×6

A₁=2×8×6

A₁=96m²

Now, we will find the area of the left and right side rectangles which joined both the triangles.

We will find the area by using the formula Area=l×b and we will multiply this area by 2 because we are finding the area of two same rectangles.

here, l=10 and b=5 and substitute these values in the formula, we get

A₂=2×10×5

A₂=100m²

Further, we will find the area of the front and end side rectangles that joined both by the base of the triangles.

We will find the area by using the formula Area=l×b and we will multiply this area by 2 because we are finding the area of two same rectangles.

here, l=16 and b=4 and substitute these values in the formula, we get

A₃=2×16×4

A₃=128m²

Furthermore, we will find the area of the left and right side rectangles which joined by the front and end rectangles.

We will find the area by using the formula Area=l×b and we will multiply this area by 2 because we are finding the area of two same rectangles.

here, l=4 and b=5 and substitute these values in the formula, we get

A₄=2×4×5

A₄=40m²

Now, we will find the area of the base of the composite figure which is rectangle.

We will find the area by using the formula Area=l×b.

here, l=16 and b=5 and substitute these values in the formula, we get

A₅=16×5

A₅=80m²

So, the surface area of the given composite figure will be

Surface area=A₁+A₂+A₃+A₄+A₅

Surface area=96m²+100m²+128m²+40m²+80m²

Surface area=444m²

Hence, the surface area of the given composite figure is 444m².

Learn more about the surface area from here brainly.com/question/1090412

#SPJ1

6 0

2 years ago

Bastien, Inc. has been manufacturing small automobiles that have averaged 50 miles per gallon of gasoline in highway driving. Th

xenn [34]

Answer:

$t=\frac{51.5-50}{\frac{6}{\sqrt{36}}}=1.5$

Now the p value for this case would be given by:

$p_v =P(z>1.5)=0.0668$

Assuming a significance level of 0.05 or 5% we see that the p value is higher than the significance level we can conclude that we FAIL to reject the null hypothesis and we don't have enough evidence to conclude that the true mean is higher than 50 miles per gallon

Step-by-step explanation:

Information given

$\bar X=51.5$ represent the sample mean for the new small cars

$\sigma=6$ represent the population deviation

$n=36$ sample size

$\mu_o =50$ represent the value to check

t would represent the statistic

$p_v$ represent the p value for the test

System of hypothesis

We want to check if the new small cars average more than 50 miles per gallon in highway driving, the system of hypothesis are:

Null hypothesis: $\mu \leq 50$

Alternative hypothesis: $\mu > 50$

Since the population deviation is given the the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

The statistic for this case is given by:

$t=\frac{51.5-50}{\frac{6}{\sqrt{36}}}=1.5$

Now the p value for this case would be given by:

$p_v =P(z>1.5)=0.0668$

Assuming a significance level of 0.05 or 5% we see that the p value is higher than the significance level we can conclude that we FAIL to reject the null hypothesis and we don't have enough evidence to conclude that the true mean is higher than 50 miles per gallon

6 0

3 years ago

Find the circumference of the circle. ​ ​Use as an approximation for .

Find the circumference of the circle. Use as an approximation for .