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29

Which expression represents the product of 3 and (n + 1.8) ?
A 5.55
B 9.15n
C 3.75 + 1.8
D 3.75 + 5.4

User Pnt
by
7.6k points

2 Answers

6 votes

Answer:

D

Explanation:

it is a strange question. but I guess its meaning is to identify an expression that is structured in the same way as the generic basic expression.

3×(n + 1.8)

after doing the multiplication this gives us

3n + 3×1.8 = 3n + 5.4

so, the only answer option including 5.4 is D.

it would mean that 3n = 3.75. n = 1.25

but just to show you how strange this question is, let's have a look at the other answer options :

is 5.55 = 3n + 5.4 ?

it would mean

0.15 = 3n

n = 0.05

so, formally, this is also an expression that represents the original expression.

9.15n = 3n + 5.4

6.15n = 5.4

n = 5.4/6.15 = 0.87804878...

so, formally, this is also an expression that represents the original expression.

3.75 + 1.8 = 3n + 5.4

5.55 = 3n + 5.4

and we are back to A and therefore, formally, this is also an expression that represents the original expression.

so, many greetings from me to your teacher. he/she has to be more careful about how to phrase questions.

because here, formally, all 4 answers are theoretically correct.

User Hana
by
7.0k points
3 votes
the answer would be D) 3.75 + 5.4
User Jasonfealy
by
6.5k points