Will a stand that can hold up to 40 pounds support a 21-kilogram television?

1 kg = 2.20 pound
21kg = 21 x 2.20 = 46.2 pounds

Since the tv is heavier than the stand can support. The stand will not support the tv.

You can find the area of a rectangle by multiplying the length and height. so multiply 1/2*7/4(which is the simpler version of 1 3/4) and you get 7/8 as your answer.