An expression is shown.

(2.8 + 9.46) × 4.5

What is the value of the expression?

55.17

Step-by-step explanation:

2.8 + 9.46 = 12.26

12.26 x 4.5 = 55.17

B

Step-by-step explanation:

the formula for the triangle is ( base * height ) / 2

Start out by multiplying the are they have by 2.  ( 16 * 2 = 32 )

Now I know that (8 * 4 ) = 32. And as we know 32 / 2 = 16 ft^2 which is the original area.

Now they want to double their height and base by two.

So we do ( 8 * 2 ) = 16 and ( 4 * 2 ) = 8 and now we calculate the area with our new values.

( 16 * 8 ) = ( 128 / 2 ) = 64 ft ^2.

Our original area was 16 ft^2 and our knew area is 64 ft^2.

We do ( 64 - 16 ) = 48 ft^2

So they increased their garden by 48 ft^2.