Which of the following will result in a rational number? Select all that apply. A. 645+9√4
B. 645−5√7
C. 645×9√4
D. 645÷5√7
help me please

B. 645−5√7

Correct me if iam wrong

it's

fa tha first one you gonna add y to both sides

it look like this

x-y+y=6+y

x=y+6

therefore your answer is

x =y+6

fa tha second one

you gonna flip tha equation

it gonna look like x-4y=y

then add 4 to both sides

it gonna look like tha

x-4 +4 =y +4

so therefore tha answer is x=y+4

step-by-step explanation: