Find the hcf of 100,24​

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?