Please help me solve the math question 3ab-9ab+7ab thanks

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Iwill give brainliest only if your correct the words subsequent and submerge both contain the prefix sub. based on this information, what does the prefix sub most likely mean? a) under or secondary b) true or verifiable c) tricky or difficult d) around or centered on

Multiply. write your answer in simplest form. 3/8 x 5/7