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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.........................It is 40.
A rhombus is a 4 sided shape with equal lengths. Even though it has equal lengths, it has opposite sides that are parallel, and angles that are equal. It also has diaginols (dashed lines) meat in the middle
20/10 is 2 so he can detail two cars an hour