Answer:
A: 779 cm²
B: 1837 cm²
Step-by-step explanation:
For both problems, use the formula for surface area of a cylinder:
SA = 2πr² + 2πrh
2πr² is the two bases.
2πrh is the curved surface.
<u>PROBLEM A</u>
"the cylinder is 60 cm long" is h = 60.
If given diameter, you can find "r" by dividing it by 2. d = 2r
Given d = 4, then r = 2.
SA = 2πr² + 2πrh
SA = 2π2² + 2π2(60)
SA = 8π + 240π Add
SA = 248π Exact answer
SA ≈ 779.114978 Answer on calculator
SA ≈ 779 Rounded answer
Remember to include the units.
The surface area is about 779 cm².
<u>PROBLEM B</u>
"80 cm long" h = 80.
"circumference of 22 cm". C = 22. Remember C = 2πr. Find "r".
C = 2πr
22 = 2πr
11 = πr
r ≈ 11/π
SA = 2πr² + 2πrh
SA = 2π(11/π)² + 22(80) Substitute 2πr with the circumference.
SA ≈ 1837.030992 Answer on calculator
SA ≈ 1837 Rounded answer
Remember to include the units.
The surface area is about 1837 cm².
Answer: apples = 7 and bananas = 8
Step-by-step explanation:
Let x represent the number of apples and y represent the number of banana,
and it was said that the total apples and bananas altogether is 15 , that is
x + y = 15 ................. equation 1
Also,
1.25x + 0.40y = 11.95 ............. equation 2
Solving the two equations simultaneously ,
From the first equation, x = 15 - y ........... equation 3
substitute equation 3 into equation 2, we have
1.25(15 - y) + 0.40y = 11.95
18.75 - 1.25y + 0.40y = 11.95
18.75 - 0.85y = 11.95
18.75 - 11.95 = 0.85y
6.8 = 0.85y
therefore y = 6.8/0.85
= 8
substitute y = 8 , into equation 3
x = 15 - 8
x = 7
Therefore , she bought 7 apples and 8 banana
2/3-1/3= 1/3
So Shane grew 1/3 of an inch more hair than his brother.
So there is 10 spaces with 4 of them blue and 3 yellow 2 red and a green
so their is a 40% of blue 30%yellow 20%of red and10% of green
next question 0-9 well this is a trick there are 10 spaces and has nothing to do with colors just number them 0-9 like this 0123456789
Right traingle
I hope it helped you!
