To determine the total class the whole class spent, you just have to simply add the individual costs of the three books. Using parenthesis, the solution can be written in the following two ways:

($15 + $9) + $12 = $36
$15 + ($9 + $12) = $36

No matter where you put the parenthesis, the final answer doesn't change. This is because of the Commutative Property of Addition. The order does not matter.

3 0

3 years ago

An adult ticket to the show costs $2 more than a student ticket. The total cost of 3 student tickets and 2 adult tickets is $39.

madreJ [45]

Answer:

An adults ticket costs $9

Step-by-step explanation:

Kids:

Adults:

So if you add 7+7+7= 21 (kids)

then do 9+9=18(adults)

Then add them together you get 39$

4 0

3 years ago

Read 2 more answers

Find the volume of the following solid:

goblinko [34]

Answer:

93214.28 cm³

Step-by-step explanation:

The area of the given solid in the front side is = area of the rectangle + area of the semi circle.

= ( 40 × 30 ) + 0.5 × π × r²

= $(40 \times 30) + 0.5 \times \frac{22}{7} \times 15^{2}$ {Since radius = 0.5 × Diameter = 0.5 × 30 = 15 cm}

= 1553.57 cm².

Now the volume of the solid is given by (Area of the vertical surface × horizontal length) = 1553.57 × 60 = 93214.28 cm³ (Answer)

5 0

3 years ago