Answer:
5.0778 × 10^-28
Explanation:
now, after my explanations in your previous questions, you should be able to do this on your own without any problems. right ?
what is it that still causes you a problem ?
again, multiplying multiplications allows us to move and group the operands freely.
and - when multiplying the same base unit, we keep the base unit and add the exponents as new exponent.
(6.51 × 10^-11) × (7.8 × 10^-18) =
= 6.51×7.8 × (10^-11)×(10^-18)
6.51×7.8 = 50.778
-11 + -18 = -11 - 18 = -29
(10^-11)×(10^-18) = 10^-29
we get
50.778 × 10^-29
so, reaching that point should have been easy for you.
now a little extra caviar :
scientific notation means ONE digit left of the decimal point, the other digits right of the decimal point, and then the correctly adapted power of 10.
but we have 2 digits left of the decimal point.
what do we have to do ?
we have to divide the left side of the number by 10 (or multiply by 1/10 or 10^-1) and multiply the right side of the number by 10 (= 10¹) to keep the number in itself unchanged.
50.778 × 10^-29 =
= 5.0778 × 10^-28