(11 + 4) ÷ 3 × squareroot of 64
( include all information not just answere that way i can better understand it)

 First, you began with PEMDAS.

P-parenthesis

E-exponents

M- multiplication

D- division

A- addition

S- subtraction

since (11+4) is in parenthesis, you start with that first so 11+4=15

now you have 15 *3 * square root of 64

simplify square root of 64 so you can easily solve the equation, the square root of 64 =8

so now you have 15*3*8

now multiply from left to right

15*3=45

45*8=360

the answer is 360

i hope this is what you were looking for.

see attached graph