Answer:
a) 7ab
b) y^3
c) e/f
Step-by-step explanation:
a) when multiplying two variables, u can just put them right next to each other, e.g. b x c = bc
when numbers are added, same goes, they just go before the variable, hence the 7ab. If u had something like 7ab x 8 then you'd just multiply the 8 with the 7 and get 56ab
b) imagine y= 2. if u had 2 x 2 x 2, that would be 8 which is also 2^3. When any number is multiplied by itself n times, it's raised to that power. which is why y x y x y = y^3. y is being multiplied by itself 3 times.
c) If u had [tex]\frac{4*2}{2}[/tex], that would = 8/2 = 4 because it would simplify. in the fraction, you could also reduce the 2 since it appears in both the numerator and denominator.
same thing here: both the numerator and denominator have 2 e and 1 f so they get crossed out, leaving e/f
hope this helps!
