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Rudik [331]
3 years ago
12

What is the surface area of a cylinder with a diameter of 8 and a height of 18?Express the answer in terms of pi

Mathematics
1 answer:
viktelen [127]3 years ago
4 0

Step-by-step explanation:

diameter: 8

radius: 4

height: 18

A=2\pi rh+2\pi r^2\\A=2\pi(4)(18)+2\pi(4)^2\\A=2\pi(72)+2\pi(16)\\A=144\pi+32\pi\\A=176\pi

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Mr Turner buys 12 pencils for $0.57 each . He pays with a $10 bill how much change would he revive
Delvig [45]
12(0.57)= 6.84

10-6.84= 3.16

Mr. Turner’s change is $3.16.


Hope this helps!
6 0
3 years ago
Read 2 more answers
A tortoise makes a journey in two parts; it can either walk at 4cm/s or crawl at 3cm/s. If the tottoise walks the first part and
Ugo [173]

Answer:

120

240

Step-by-step explanation:

We call the length of first part x

Length of second part = y

In the first scenario, it took the tortoise 110 sec to walk the first part and crawl the second.

So,

We have this equation,

x/4 + y/3 = 110

We take the LCM

(3x + 4y)/12 = 110

When we cross multiply

3x + 4y = 110x12

3x + 4y = 1320 ----- equation 1

For scenario 2

x/3 + y/4 = 100

When we take the LCM

(4x + 3y)/12 = 100

We cross multiply

4x + 3y = 100x12

4x + 3y = 1200 ------ equation 2

We now have two equations and we will solve for x and y using simultaneous linear equation.

3x + 4y = 1320 ----- 1

4x + 3y = 1200 ----- 2

We subtract equation 2 from 1 to get

- x + y = 120

We make y subject

y = x + 120 ----- 3

We put the value of y in equation 3 into equation 1

3x + 4(x + 120) = 1320

3x + 4x + 480 = 1320

7x + 480 = 1320

7x = 1320-480

7x = 840

We divide through by 7

x = 840/7

x = 120

We put value of x in equation 3

y = x + 120

y = 120 + 120

y = 240

120 and 240 are the lengths of the 2 parts of the journey.

Thanks

5 0
3 years ago
X+5-8x=26<br> Solve for x
salantis [7]
X = -3 

Pull out the like terms: -7x - 21 = -7 × ( x + 3) 

Solve: -7 = 0 

Solve: x + 3 = 0

Subtract 3 from both sides of the equation 

So, x = -3
 
5 0
3 years ago
Read 2 more answers
-7d - 3 = 11<br>what's the answer please ​
Naily [24]

Answer:

-2

Step-by-step explanation:

add 3 to 11 and then divide 14 by -7

5 0
3 years ago
Read 2 more answers
2x + 25x9 +3<br> What would x be for it to be equal
andrey2020 [161]

Answer:

X=144

Step-by-step explanation:

2X+25×9+3=0

2X+288

2X= -288

X= -144

8 0
3 years ago
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