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True [87]
2 years ago
13

» The diameter of a circle is 38 kilometers. What is the circle's area? Use 3.14 for n.

Mathematics
2 answers:
german2 years ago
7 0

Answer:

Use the formula pi×d : 3.14×38 km

So, it's 119.32

(that's what i know)

anyanavicka [17]2 years ago
4 0

The formula for area of a circle is :

Area = pi x radius^2


Radius is half the diameter.

Radius = 38/2 = 19 kilometers


Area = 3.14 x 19^2

Area = 1,133.54 square kilometers

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Your family plans to start a small business in your neighborhood. Your father borrows $10,000 from the bank at an annual interes
valkas [14]

Answer:

$2400

Step-by-step explanation:

First, converting R percent to r a decimal

r = R/100 = 8%/100 = 0.08 per year,

putting time into years for simplicity,

36 months ÷ 12 months/year = 3 years,

then, solving our equation

I = 10000 × 0.08 × 3 = 2400

I = $ 2,400.00

The simple interest accumulated

on a principal of $ 10,000.00

at a rate of 8% per year

for 3 years (36 months) is $ 2,400.00.

8 0
3 years ago
A cell phone plan costs $23.70 per month for 700 minutes of talk time. It costs an additional $0.06 per minute for each minute o
laiz [17]

Answer:

2,541 minutes

Step-by-step explanation:

195.12 = .06m+23.7+ 0.8(23.7)

195.12 = 23.7 + 0.06m + (18.96)

195.12 = 42.66 + 0.06m

152.46 = 0.06m

2,541 = m

6 0
4 years ago
Two different families pay for entry into a water park.
icang [17]

Answer:

Adult ticket: $7

Child ticket: $2

Step-by-step explanation:

Set up a system of equations where a represents the cost of one adult ticket and c is the cost of one child ticket:

2a + 3c = 20

a + 4c = 15

Solve by elimination by multiplying the bottom equation by -2:

2a + 3c = 20

-2a -8c = -30

Add them together:

-5c = -10

c = 2

Now, we can plug in 2 as c to find the value of a:

2a + 3c = 20

2a + 3(2) = 20

2a + 6 = 20

2a = 14

a = 7

6 0
4 years ago
The Chartered Financial Analyst (CFA) designation is fast becoming a requirement for serious investment professionals. Although
Nastasia [14]

Answer:  ($141,775, $158,225)

Step-by-step explanation:

Given : Significance level : \alpha: 1-0.9=0.1

Critical value : z_{\alpha/2}=1.645

Sample size : n= 49

Sample mean : \overline{x}=150,000

Standard deviation : \sigma=35,000

The confidence interval for population mean is given by :_

\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}

= 150,000\pm (1.645)\dfrac{35000}{\sqrt{49}}\\\\\approx150,000\pm8225\\\\=(150,000-8225,150,000+8225)=(141,775,158,225)

Hence,he 90% confidence interval for the average salary of a CFA charter-holder = ($141,775, $158,225)

7 0
3 years ago
Answer it pls option c
Troyanec [42]

Answer:

x = \frac{1}{4}

Step-by-step explanation:

\frac{x}{2} +\frac{3}{4} =\frac{7}{8}

→ Find the LCM of the denominators (2,4 and 8)

LCM = 8

→ Multiply the whole equation by 8 to get rid of the fractions

4x + 6 = 7

→ Minus 6 from both sides to isolate 4x

4x = 1

→ Divide both sides by 4 to isolate x

x = \frac{1}{4}

5 0
3 years ago
Read 2 more answers
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