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3 years ago

7. A number is multiplied by four, then five is subtracted from the product. The result i three. What is the number?

Mathematics

2 answers:

Anika [276]3 years ago

7 0

Answer:

The answer is 2, the number 2 is multiplied by 4 which equals 8. 8 is then subtracted by 5 which makes the result 3.

Maru [420]3 years ago

6 0

maybe the answer is 4 i don't have an computation but it feels 4

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What is the product?<br> (6r-1)(- Br-3)

Andru [333]

Answer:

$-6Br^2-18r+Br+3$

Step-by-step explanation:

we have the expression:

$(6r-1)(- Br-3)$

We need to multiply the two terms in the first parenthesis by the two terms in the second parenthesis:

$(6r)(-Br)+(6r)(-3)+(-1)(-Br)+(-1)(-3)$

we solve each term taking into account the law of signs

(-)(-)=+

and

(+)(-)=-

also for the first term we use that $r*r=r^2$

thus we have:

$-6Br^2-18r+Br+3$

it can be simplified a little more if we factor an r of the second and third term:

$-6Br^2+r(-18+B)+3$

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