Simplify: (6a +5)(4a+5)

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)