6(x+3)=21
(Explain it pls!)

x=1/2

Step-by-step explanation:

6(x+3)=21

Step 1: Distribute 6 into (x+3)

6(x) = 6x

6(3) = 18

We're left with 6x+18=21

Step 2: Subtract 18 from 21

6x=21-18

6x=3

Step 3: Divide each side by 6 to isolate x

x=3/6

Step 4: Simplify

x=1/2

So, first you multiply 6 times x. You'll get 6x, then you multiply 6x3. You get 18. If we reverse the equation we get 21-18=3, 6x1/2=3. Therefore x=1/2

Step-by-step explanation:

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8  

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