Which expressions are equivalent to 4b choose all answers that apply: a. b+2(b+2b) b. 3b+b c.2(2b)

c and b are your answers

b. 3b+b

c.2(2b)

Step-by-step explanation:

Option a is

b+2(b+2b) = b+2(3b) Adding the like terms b and 2b

                    =b+6b

                     =7b

Option b is :

3b+b = 4b (Like terms can be added)

Option c is

2(2b) = 4b. [ 2x2=4]

OPtions b and c both equal 4b.

true

step-by-step explanation:

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47