The answers to this question 4/3
Um... -16 is a number.
Hope this helps :)
Polynomials consist of different types of terms - terms conatining variables as well as integers . These are added separately whereas with integers its just one type of value , numerical.
Let's assume the ladder's long as x
sin 45 = 7/x
1/2^0.5 = 7/x
x = 7*1.414
x = 9.9 m
so long of the ladder is 9.9 m