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Ilia_Sergeevich [38]
3 years ago
8

If a circle has a circumference of 4.6pi what is the area?

Mathematics
2 answers:
Brums [2.3K]3 years ago
8 0

Answer:

16.62

Step-by-step explanation:

formula for area of a circle is \pi r^{2} 4.6 is the diameter and radius is 1/2 of diameter so \pi 2.3^{2} is the equation

Alla [95]3 years ago
5 0

Answer:

r = 0.732 d = 1.46 C = 4.6

Step-by-step explanation:

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y is directly proportional to the positive square root of( x+2)² when x = 8 y= 250 find y when x = 4​
gulaghasi [49]

Answer:

150

Step-by-step explanation:

Since y is directly proportional to sqrt((x+2)^2), there is a constant,k, such that

y=ksqrt((x+2)^2)

We are given a pair (x,y) in this relation. Let's plug in (8,250 ) to find k.

250=ksqrt((8+2)^2)

250=ksqrt((10)^2)

250=k10

250/10=k

25=k

So for any pair (x,y) we have the relation y=25((x+2)^2).

We are asked to find y when x=4.

y=25((4+2))^2

y=25(6)

y=150

Test to see if y is proportional to sqrt((x+2)^2)

For the given points: 250/150=10/6

The equation is true so we're great.

5 0
3 years ago
The mass of an electron is approximately 9.11 × 10 -28 grams. Find the mass of 401,000,000 electrons. 3.65311 × 10-19 grams 3.65
NNADVOKAT [17]

Answer:

Total\ Mass = 3.65311 * 10^{-19} grams

Step-by-step explanation:

Given

Mass = 9.11 * 10^{-28}g

Required

Determine the mass of 401,000,000 electrons

To do this, we simply multiply the mass of 1 electron by the number of electrons.

This gives:

Total\ Mass = 401,000,000 * 9.11 * 10^{-28}

Total\ Mass = 3653110000 * 10^{-28}

Express 3653110000 as a standard form

Total\ Mass = 3.65311 * 10^9 * 10^{-28}

Apply law of indices:

Total\ Mass = 3.65311 * 10^{9-28}

Total\ Mass = 3.65311 * 10^{-19}

Hence, the mass of 401000000 electrons is 3.65311 * 10^{-19}\ grams

4 0
3 years ago
ANSWER QUICK FOR BRANLIEST PLEASEEE There are 8 frosted donuts and 56 not frosted. What is the ration of frosted to total
shusha [124]

Answer:

8:64

Step-by-step explanation:

I'm not sure tho. hope you get it right!!!

4 0
3 years ago
Read 2 more answers
I need help on all of them pleaseeee​
dmitriy555 [2]

Step-by-step explanation:

90÷0.018=5000

90÷0.18= 500

90÷1.8 = 50

90÷18 =5

90÷180 =0.5

5 0
3 years ago
Rosetta owns a wedding photography business. For each wedding, she charges $100 plus $50 per hour of work. A linear equation tha
Lena [83]

The options are not clear enough, so i have attached it.

Answer:

A: The independent variable (x) is the amount of time Rosetta shoots photos. The dependent variable (y) is the amount, in dollars, Rosetta earns for a wedding.

Rosetta charges a one-time fee of $100 (this is when x = 0), so the y-intercept is 100. Rosetta earns $50 for each hour she works, so the slope is 50

Step-by-step explanation:

We are given the equation of total amount of money Rosetta earns per wedding as;

y = 50x + 100

Where x is number of hours.

Now, the independent variable will be x because it doesn't depend on any other variable whereas the dependent variable will be y because it depends on how many hours which is x.

Now, the y-intercept occurs when x = 0.

Thus;

y = 50(0) + 100

y = 100

Thus,she charges a one time fee of $100, so the y-intercept = $100 at x = 0.

From slope intercept equation which is;

y = mx + c and comparing with y = 50x + 100, where m is the slope, we can see that m = 50.

Thus, since she earns $50 per hour, the slope is 50.

The correct option is Option A.

4 0
3 years ago
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