Answer:
Manuel received 28 purple pins.
Step-by-step explanation:
This is a simple equation. If he received 40 pounds and 70% of them are purple then the number of purple pins is 40 * 70% = 28.
c)
(10x+5)-(-23-2x)=
10x+5+23+2x
=12x+28
2x+5x^2-(3x+7x^2)=
2x+5x^2-3x-7x^2
= -2x^2-1
an isosceles triangle
it has two equal sides so this is isosceles triangle
Im pretty sure the answer is B) f=2.5b
C
C=2πR
circumference equals two times pi times radius
