Answer is 18 If you know your division you just divide then you will see that you find something common that answer would be 18 also to get this answer i used GCF First what i did was find out what the factors of 72 then i look at the factors of 90
To find how long it takes for the object to hit the ground you need to set h(t)=0 after this you need to find the number that when plugged into t makes the equation equal to 0
