-4 + 21 = 17
4% of 21 = 4% * 21 = 0.04 * 21 = 0.84 or 84%
21 + (4 x 2) = 29 (21 + 4) x 2 = 50
21
The mixed number for 21/4 is 5 1/4.
((1/3) x 4 )/21 = (4/3)/21 = 4/63
Product is found by multiplication, therefore 21 multiplied by 4 (21 * 4) = 84
7 and 4/21 = 151/21
sqrt(4) + 21 = 2 + 21 = 23
21/4 is equal to 5.25 or 5 1/4
4 + 17 = 21
21/4 = 51/4