Suppose a+b=0 so what equals a-b

a-b = 2a  

a-b = -2b

Step-by-step explanation:

a+b = 0

Subtract b from each side

a+b - b=0-b

a = -b

a-b =

Replace a with -b

-b -b= -2b

a = -b

Divide by -1

-a =b

or replace b with -a

a - (-a)

a+a

2a

a) 0.25x times 3. (could be wrong on equation.)

b) 2.25 pound of dark chocolate. (can i eat all the chocolate? plz? anyway, again, could be wrong, but i hope im right. all the chocolate together should be 5.25 pounds)

have a good day!

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92