Question

Helppppppppp!!!!!!!!!!!

A tree is 21 feet tall. How tall will it be in 3 years if it grows
foot each year?
Which method will NOT give the correct number of feet?

Answer 1

First, lets find the height of the tree in 3 years. (2 1/2 = 2 2/4)

2 2/4 + 1/4 + 1/4 + 1/4 = 3 1/4 feet tall.

Let's check all the answer choices. Note that for all of these questions we need common denominators so 2 1/2 = 2 2/4. The choice in bold will be the correct answer.

Add 2 1/2 + 1/4 + 1/4 + 1/4.

Find common denominators and add.

2 2/4 + 1/4 + 1/4 + 1/4 = 3 1/4 feet tall.

Therefore, this option is correct.

Multiply 3 * 1/4 and then add 2 1/2.

3 * 1/4 = 3/4

2 2/4 + 3/4 = 3 14 feet tall.

Therefore, this option is correct.

Multiply 2 1/2 * 3 and then add 1/4.

2 1/2 * 3 = 7 1/2 or 7 2/4

7 2/4 + 1/4 = 7 3/4 feet tall.

Therefore, this option is NOT correct.

Multiply 1/4 * 3 and then add 2 2/4.

1/4 * 3 = 3/4

3/4 + 2 2/4 = 3 1/4 feet tall.

Therefore, this option is correct.

Best of Luck!