A sail on a sailboat can be made from a material called sailcloth . Discount Marine Sports sells sailcloth for 12.75 per square yard. Jessica models a triangular sail on a coordinate plane with coordinates of the vertices of the triangle (0,0) (4,0) and (3,6). Enter the cost of purchasing the sailcloth for this sail not including any overlap of stitching on the sail .

answer: i don't understand it

step-by-step explanation: sorry

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

i think it’s c i believe