MATHEMATICS MIDDLE SCHOOL

If the circumference of a spherical object is 43.96 ​cm, what is the surface area of the​ object? Use 3.14 for pi im doing math with surface area fora sphere

Answers

Answer 1
Answer: c=2pir
SA=4pir^2

43.96=2pir
divide both sides by 2
21.98=pir
divide both sides by pi (aprox pi to 3.14)
7=r

SA=4pir^2
SA=4pi7^2
SA=4pi49
SA=196pi

aproxpi=3.14
sa=615.44 cm^2
Answer 2
Answer: Solutions 

Finding the sum of all the areas of each face on a 3-D object is called calculating the surface area. To calculate the surface area you use the formula  c=2πr. 

Calculate 

SA = 4πr² 

43.96 = 2πr

Divide each of the side by 2

43.96 = 2πr ÷ 2 

21.98 = πr

divide both sides by π (approximate π to 3.14)

7=r


SA=4πr²

SA=4π7²

SA=4π49

SA=196pi

SA =615.44 cm²

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Is 10.55 less than or greater than 10.54

Answers

Answer:

10.55 is greater than 10.54.

Step-by-step explanation:

10.55 is greater than 10.54 because it comes after it on the number line.

Can you guys help me simply this

Answers

Simplify the expression.
Exact Form:
10
3
10
3
Decimal Form:
3.
¯
3
Mixed Number Form:
3
1
3

Seventy-five percent of what number is 33.75?A.144
B.25.3125
C.45
D.27

Answers

Make an equation:

75% * x = 33.75

0.75x = 33.75

Divide 0.75 to both sides:

x = 45

A cell phone plan uses a fixed charge of $20 per month plus 10 cents for each minute used to calculate the total bill. The total bill, t, can be expressed in terms of the number of minutes, m, by the function rule t=20+0.10m. Which rule describes the inverse function?t=20−0.10m

m=20+0.10t

t=−20+0.10m

m=10t−200

Answers

We have function t=20+0.10m and we want to find inverse function, so we want to have value of m in times of t.
t=20+0.10m  /-20 both sides
t-20=0.10m    /*10 (multiply both sides by 10)
10t-200=m
m=10t-200     - its the final result, so the answer is D.

Select all the correct answers.Identify all the lines on the graph with unit rates that are less than 2 and greater than the unit rate of the relationship in the table.
line 1
line 2
line 3
line 4
line 5

Answers

Answer:

recall that the slope, namely the average unit rate of change, is rise/run.

so, what's the slope for the function in the table?  well, we can simply pick any two points and get it, or just use the first point rise of 8 and a run of 7, gives us a slope of 8/7 or 1⅐.

now, let's take a peek at the lines, they all have a "rise" of 6, notice they're all lying on the y = 6 line horizontally.

1)

rise = 6, run = 2, slope 6/2 = 3.

well, 3 is more than 2, so no that one.

2)

rise = 6, run = 3, slope = 6/3 = 2.

well 2 = 2, so no that one either.

3)

rise = 6, run = 4, slope 6/4 = 3/2.

3/2 is actually larger than 8/7 and less than 2, you can check. so ✔

4)

rise = 6, run = 5, slope = 6/5.

6/5 or 1⅕ is more than 8/7, and is clearly less than 2, so ✔

5)

rise = 6, run = 6, slope = 6/6 = 1.

well, needless to say 1 is less than 2 but is less than 8/7, recall 8/7 is actually 1⅐.

Answer:

line 3 and 4

Step-by-step explanation:

Sasha drove from her house to the grocery store in 20 minutes. Her return trip took 15 minutes. If the store is 7 miles from her house, what was Sasha's average speed for the round trip, in miles per hour?

Answers

Total time = 35 minutes
Total distance = 14 miles

I would set this up as a proportion

14/35 = x/60  (60 minutes in an hour)
Now cross multiply and solve.
35x = 840
840/35 = 24 mph
distance = rate * time
7 miles = rate * 20 minutes 
7/20 = 20r/20
r = 0.35 mph
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