What is the surface area of this design?

I don't know what you are talking about and where is the design, but here is the formula. Tell me if you need more help.

See below.

Step-by-step explanation:

Surface area formula for cylinder: A=2πrh+2πr2

Surface area formula for rectangle:  A = 2wl + 2lh + 2hw

Surface area formula for rectangle prism: L* W* H

Surface area formula for circle: A = \pi r^2

Hope this helps.

70 years.

step-by-step explanation:

whole number data type

step-by-step explanation:

as whole number type represents whole number

like 1, 2 ,3, 4

in other words the whole numbers are those numbers which cannot be written infraction.

since we can take days as a whole number i.e 1 day 2 day and we cannot write 1.2 day hence we will use whole number data type