3 years ago

Which expressions are equivalent to -3(2+7) A: -6+21 or B:-21+6

Mathematics

1 answer:

Neporo4naja [7]3 years ago

3 0

Answer:

None

Explanation:

-3(2+7) = -3×9 = -27

-6+21 = 15

-21+6 = -15

Hence there is no equivalence

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RUDIKE [14]

Use subsiution]
y=-3x+5
subsitute -3x+5 for y in second equation
5x-4(-3x+5)=-3
distribute
5x+12x-20=-3
add like terms
17x-20=-3
add 20 to both sides
17x=17
divide both sides by 17
x=1
now subsitute 1 for x
y=-3x+5
y=-3(1)+5
y=-3+5
y=2

x=1
y=2

4 0

3 years ago

Jack plays on a basketball team after school third day of the month he babysits every seventh day of the month how many times du

Alex787 [66]

Great question!
If you draw a calendar see attachment for mine.you will see that the dates for Basketball are
3,6,9,12,15,18,21,24,27,30
and the dates for Babysitting are
7,14,21,28

There would only be a conflict on the 21st! So the answer is 1 time!