Consider this right triangle with the given measures.

13

Step-by-step explanation:

We were already given the formula and were left with .

To find c we would find what by itself equals 169.

We know is 144

so its greater than 12

we also know that 13 * 13 is 169

so c would be equal to 169

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!

48 / 6 = x

in this case, x will equal the amount of money in each card!

x therefore will be 8.

trent had $8 in each birthday card.