7) John bought I pineapple, 1 bag of cherries and 3 watermelons at a fruit stand. The
pineapple cost $2.80, the bag of cherries cost $3.90 and the watermelons were each $1.80.
If he paid with a twenty dollar bill, how much change should he get back?

$7.90

$1.80 x 3 = $5.40

5.40 + 2.80 +3.90

20 - 12.10

oof tough question

step-by-step explanation:

sorry i can't ya : c gl tho

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2