All categories

3 years ago

Please help me just a and d

Mathematics

2 answers:

Softa [21]3 years ago

8 0

C = 2 x pi x r

if r = 5 cm

C = 2 x pi x 5 = 10 x pi

≈ 10 x 3,14 ≈ 31,4 cm

C = 2 x pi x r = pi x d

if d = 2 m

C = pi x 2

≈ 3,14 x 2 ≈ 6,28 m

Crank3 years ago

7 0

Hello!

C = 2πr C= 2*π *5 31,4cm

= 2*3,14* 5

r =2/2 => 1m

C= 2πr C= 2*π*1 6,28m

= 2 *3,14*1

You might be interested in

Suppose you want to start saving for retirement. You decide to continuously invest $20000 of your income each year in a risk-fre

Korvikt [17]

Answer:

Following are the solution to the given points:

Step-by-step explanation:

p= amount at any time

then $\frac{dp}{dt}=0.07 p$

$p=p_0 (1+e^{0.07 t) \\\\$

$P_0=\ principle \ amount \\\\ interest \ =p-p_0=p_0e^{0.07t}\\\\ p=y\frac{dy}{dt}=0.07y_0$

at time $= t\ years$

$\frac{dp}{dt}\\\\c_0=\$ \ 20000\ year\\\\p \to p+dp\\\\ dp=0.07p+c_0$

y= amount at any times

$\frac{dy}{dt}=0.07y+c_0\\\\dt= \frac{dy}{c_0+0.07y}$

For point a:

$\frac{dy}{dt}=20000+0.07 y$

For point b:

$\frac{dy}{20000+0.07 y}=dt\\\\\frac{1}{0.07}|n(\frac{0.07y+20000}{20000})=t\\\\\frac{0.07y}{20000}+1=e^{0.07t}\\\\y=7.1428\times 10^4[e^{0.07t} -1]\\\\y=\frac{20000}{0.07}[e^{0.07t}-1]\\\\$

For point c:

$y(30)=827391.75$

4 0

3 years ago

{y +2 = 4x<br> {y = 3x - 1

jeka94

.Answer:

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

HELP ASAP 10 POINTS AND BRAINLYEST AND 5 STAR AND THANKS BUT IF CORRECT

nikitadnepr [17]

Answer:

Step-by-step explanation:

The opposite faces are congruent, that is the surface area (SA) is

SA = top/ bottom + 2 sides + front/ back

= (3 × 2) + (3 × 2) + (2 × 5) + (2 × 5)+ (3 × 5) + (3 × 5)

= 6 + 6 + 10 + 10 + 15 + 15

4 0

3 years ago

A newsgroup is interested in constructing a 90% confidence interval for the proportion of all Americans who are in favor of a ne

Evgen [1.6K]

Answer:

a. With 90% confidence the proportion of all Americans who favor the new Green initiative is between 0.6290 and 0.6948.

b. If the sample size is changed, the confidence interval changes as the standard error depends on sample size.

About 90% percent of these confidence intervals will contain the true population proportion of Americans who favor the Green initiative and about 10% percent will not contain the true population proportion.

Step-by-step explanation:

We have to calculate a 90% confidence interval for the proportion.

The sample proportion is p=0.6619.

$p=X/n=370/559=0.6619$