The expression in scientific notation is given as follows:
3.5 x 10³.
<h3>What is scientific notation?</h3>
A number in scientific notation is given by:

With the base being
.
For this problem, the expression is given by:

When two factors of a multiplication have the same base and different exponent, we <u>keep the base and add the exponents,</u> hence:

5 x 4.2 = 21, hence the expression is:

When we divide two terms with the same base and different exponents, we keep the base and subtract the exponents, hence:

Which is the simplified expression.
More can be learned about scientific notation at brainly.com/question/16394306
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Answer:
Solving the equation
using quadratic formula we get 
Step-by-step explanation:
We need to solve the equation
using quadratic formula.
The quadratic formula is:

where a=1, b=-8 and c=41
Putting values in formula and finding x

So, Solving the equation
using quadratic formula we get 
Answer:
The answer is
20x + 17.5
Step-by-step explanation:
Multiply the 5 by the numbers inside the parenthesis.
5 x 4x
5 x 3.5