Answer:
-20 ÷ (u +v) or -20/(u +v)
Explanation:
You want an expression that represents the quotient of -20 and the sum of u and v.
Sum
The sum of two quantities is indicated with a plus (+) sign.
"The sum of u and v" is written in symbols as ...
u + v
Quotient
The wording "the quotient of a and b" means "a divided by b". It is written in symbols using a division sign or fraction bar:
a ÷ b or a/b
The desired quotient can be written as ...
-20 ÷ (u +v) or -20/(u +v)
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Additional comment
The parentheses are needed so that the sum is computed before the quotient is computed. If the expression is typeset, the division bar does the grouping:
