Last night you went to a restaurant, and the bill for 3 adult meals and 2 children’s meals was £73. Last week you went to the same restaurant and paid £89 for 2 adult meals and 5 children’s meals.

Let a = cost of an adult meal,

and c = cost of a child meal.

A) Form an equation for last night’s meal

? = ?

B) Form an equation for last week's meal

? = ?

3a + 2c = 73   (last night)

2a + 5c = 89 (last week)

Step-by-step explanation:

then, the surface area of the sphere shown in the image is: 256π sq. units!

step-by-step explanation:

the lateral surface area of a sphere is 2πrh where h=2r.

then:

surface area = 4πr^2.

in this case, r=8 units ⇒ surface area = 4π(8 units)^2. = 256π sq. units!

then, the surface area of the sphere shown in the image is: 256π sq. units!