Please can someone answer this for the love of GOD?! Please and I will give you 5 stars or a Thanks?!
1 answer:
Answer:
4) 120π cm^2
5) 56π cm^2
6) 32π cm^2
Step-by-step explanation:
Surface Area of Cylinder = 2π + (2πr)(height)
(will use variable h for height)
4)
diameter = 8 cm
r = 0.5(diameter) = 0.5(8) = 4 cm
height = 11 cm
2π + (2π)(4)(11)
= 2π(16) + 2π(44)
= 32π + 88π
= 120π cm^2
5)
diameter = 8 cm
r = 0.5(diameter) = 0.5(8) = 4 cm
height = 6 cm
2π + (2π)(4)(6)
= 2π(16) + 2π(12)
= 32π + 24π
= 56π cm^2
6)
diameter = 6 cm
r = 0.5(diameter) = 0.5(6) = 3 cm
height = 7 cm
2π + (2π)(3)(7)
= 2π(9) + 2π(7)
= 18π + 14π
= 32π cm^2
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Answer:
She did not multiply equation 3 in step 2 by the correct value.
Step-by-step explanation:
Given:
In order to solve this, we need to eliminate any one variable and then form a simultaneous equation with the remaining two variables. Then, we nee to solve the simultaneous equation.
Here, Galena is trying to eliminate the variable first.
Step 1: She multiplies equation (3) by 3 and adds it to equation (1)
Let us multiply equation (3) by 3
Now, adding this to equation 1 will cancel out z terms.
Now, she need to make one more equation in .
Step 2: She multiplies equation (3) by -7 and adds it to equation (2)
Multiplying equation (3) by -7 will give,
Now, adding this to equation 2 will not cancel out z terms.
So, she makes mistake in step 2 as the terms are not being cancelled.