HELP ME PLEASE!!!this is due in 10 minutes The lengths of the sides of a triangle are x,2x and 2x centimetres. If the perimeter is 20 centimeters, what is the value of x?

a)4
b)5
c)8
d)10​

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

What is the remainder when 2872 is divided by 76? a) 51 b) 57 c) 60 d) 63

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15