Answer:
so, the figure here is a cylinder with a semi sphere on the top, we know the height of whole structure, and the radius of the semi sphere, which is the same as the radius of the cylinder (you can see it because the radius of the semisphere is constant, and you can thin on it as half a sphere over a cylinder).
First, the cylinder will be the structure without the semi sphere, so his height will be te total height minus the radius of the semi sphere, which is 0.9μm.
so now we know the height and the radius of the cylinder, the surface or the sides of it is 2*3.14*r*h = 2*3.14*0.9μm*0.1μm = 0.5662.
Answer:
He needs to save 30 dollars
Step-by-step explanation:
30 X 5 = 150
150 plus what she has equals 250
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30 is the answer.
How you solve it:
You take 3X and divide it by 3, then do the same thing to 90 and you will get 30.