Variables and Expressions 1

A local hospital is holding
a raffle as a fundraiser.

The individual cost of
participating in the raffle

is given by the following
expression-- 5t plus 3,

or 5 times t plus 3,
where t represents

the number of tickets
someone purchases.

Evaluate the expression when t
is equal to 1, t is equal to 8,

and t is equal to 10.

So let's first
take the situation

where t is equal to 1.

Then this expression
right over here

becomes-- and I'll use that
same color-- becomes 5 times 1.

5 times 1 plus 3.

5 times 1 plus 3, and we know
from order of operations,

you do the multiplication
before you do the addition.

So this will be 5
times 1 is 5 plus 3,

and then this is
clearly equal to 8.

Now let's do it when
t is equal to 8.

So when t is equal to 8,
this expression becomes--

and I'll do the same colors
again-- 5 times 8 plus 3.

Same color of green.

And once again, 5 times 8 is
40, and then we have the plus 3,

there so this is equal to 43.

And so we have the
last situation,

with t is equal to 10.

I'll do that in blue.

So we have 5 times 10.

So 5t is 5 times 10.

Instead of a t, put a 10 there.

5 times 10 plus 3.

That's a slightly
different shade of green,

but I think you get the idea.

5 times 10 is 50.

We do 50, and then we're going
to have to add 3 to that,

and that is equal to 53.

And we're done.