Sam needs to solve 4(5 – a) = 12. Describe a move Sam could use to start to solve the equation.

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Step-by-step explanation:

4 x 5 = 20

4 x -a = -4a

-4a + 20 = 12

-20 From both sides

-4a = -8

Divide both sides by negative 4

a = 2

Step-by-step explanation:

4(5-a)=12 divide each side by 4

5-a=3 subtract 5 from each side

-a=-2 divide each side by -1

a=2

or

4(5-a)=12 carry out multiplication indicated on left side

20-4a=12 subtract 20 from each side

-4a=-8 divide each side by -4

a=2

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.