2 years ago

PLEASE HELP ASAPPPPP

Mathematics

1 answer:

sveticcg [70]2 years ago

4 0

Answer:

506.7 cm²

Step-by-step explanation:

The amount of cardboard needed would be the surface area of the cone,

S= pi(r)(l+r) where r is the radius and l is the slant height.

You can find l using the Pythagorean theorem. l²=r²+h² which is l²=6²+20² and you get l = √436.

Plug r and l into the equation: S = 6pi(√436 + 6) = 506.7 cm²

Let me know if you have any questions about my steps!

You might be interested in

The area of square pond is 5625meter square and 2 meter width path is made around the pond

algol13

Answer:

Step-by-step explanation:

good luck hoped it helped

7 0

3 years ago

Read 2 more answers

Can someone help me? Thanks! :)

attashe74 [19]

Answer:

75 is the length of the third side

7 0

3 years ago

Read 2 more answers

Solve for u.<br> -6=-2u +4(u-5)

sergij07 [2.7K]

Answer: u=7

Step-by-step explanation:

-6= -2u+4(u-5)

-6= -2u+4u-20

-6= 2u-20

14= 2u

7=u

5 0

3 years ago

Read 2 more answers

Scores from an exam are normally distributed with a mean of 85 and a standard deviation of 5. Suppose 188 students take the exam

charle [14.2K]

The mean is $\mu=85$ and standard deviation is $\sigma=5$ . Then the variable $X\sim N(85,5)$ .

Use substitution $Z=\dfrac{X-\mu}{\sigma}=\dfrac{X-85}{5}$ , then the variable $Z\sim N(0,1)$ .

The probability $Pr(X>80)$ can be calculated in the following way:

for X=80, $Z=\dfrac{80-85}{5} =-1$ and $Pr(X>80)=Pr(Z>-1)$ . From the diagram $Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84$ .

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

4 0

3 years ago

Read 2 more answers

A waiter had fifty-seven customers. If twenty-three left, how many customers would the waiter still have?

Sav [38]

Answer:

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers