Let's say that number is hmmm "a"

now.. twice "a" is 2*a or 2a
4 less than that is " 2a - 4"

now, the product of those two fellows is 286, well ok

a( 2a - 4) = 286

thus

$\bf a(2a-4)=286\implies 2a^2-4a^2=286\implies a^2-2a^2=143
\\\\\\
a^2-2a^2-143=0\implies (a-13)(a+11)=0
\\\\\\
\begin{cases}
a-13=0\implies &a=13\\
a+11=0\implies &\boxed{a=-11}
\end{cases}$

5 0

4 years ago

Simplify (−6.5)(2)(−5).

Dmitry_Shevchenko [17]

65 is the answer,I just put it into a calculator,but all that really is is multiplying,a negative times a negative equals a positive so you would take -6.5×2=-13
-13×-5=65

5 0

4 years ago

Read 2 more answers

8qt equals gallon and qt

joja [24]

Answer:

2 Gallons

Step-by-step explanation:

1 Gallon = 4 quarts

There are 8 quarts, and 8 divided by 4 is 2.

2 Gallons.

5 0