Given: (4.2*10^-1)*(5.7*10^-1)
PEMDAS: Parenthesis, Exponents, Multiplication, Division, Addition, Subtraction
Parenthesis: Exponents: In both parenthesis power 10 to -1: (4.2*.1)*(5.7*.1)
Parenthesis: Multiplication: Fix the parenthesis equations: .42*.57
Multiplication: Multiply .42 and .57 for answer: .42*.57=.2394
Answer: .2394