12. 14.5% of 90 is n. The value of n is 15.​

14.5% of 19 is 13.05, so the value of n would actually be 13.05

14.5% of 19 is 13.05, so the value of n would actually be 13.05

Step-by-step explanation:

the answer is D.  576 square cm

Step-by-step explanation:

Find the area of one of the rectangular faces using the formula, Area = lw.

A = (12 cm) (6 cm)

A = 72 square cm

Since there are 4 rectangular faces, multiply the area of one rectangular face by 4 to get a total of 288 square cm.

The area of one of the congruent squares is 12 cm × 12 cm, or 144 cm2. Multiply 144 cm2 by 2 to get a total of 288 cm2.

To find the surface area of the rectangular prism, add the area of the four rectangular faces to the area of the two square faces.

288 square cm + 288 square cm = 576 square cm