A is the point (-5,2) b is the point (7,-2)
c is the point (-2,5)
a) find the gradient of a line perpendicular to line AB.
b) Find the equation of the line perpendicular to line AB and passing through point C.

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g

Answer this question i need as soon as possible

Suppose that the function f is defined. , for all real numbers, as follows. _ \ 1/4x² -4 if x≠ -2 f(x)=< /_-1 if x=-2 find f(-5), f(-2), and f(4)