Unit 5 Review

Select all the true statements.

• A. 2.3 + (−2.3) is equal to zero.

• B. (−3.7) + (−4.1) is positive.

• C. −2.6 − (−2.4) is positive.

• D. ( 5/2 + (−2.5) ) is negative.

• E. 72 − (−100) is negative.

Answer explanation

a) The sum of two opposite numbers is zero.

b) When adding two numbers with the same sign, you keep that sign in the sum.

c) When subtracting, you can "add the opposite," then follow the addition rules.

d) When adding numbers with opposite signs, you keep the sign of the number with the larger absolute value.

e) When subtracting, you can "add the opposite," then follow the addition rules.

A heron is perched in a tree 50 feet above sea level. Directly below the heron, a pelican is flying 17 feet above sea level. Directly below them is a trout, swimming 23 feet below sea level.

True or False?

The difference in height between the pelican and the heron is -33 feet.

• True

• False

A heron is perched in a tree 50 feet above sea level. Directly below the heron, a pelican is flying 17 feet above sea level. Directly below them is a trout, swimming 23 feet below sea level.

True or False?

The difference in height between the pelican and the trout is 40 feet.

• True

• False

A heron is perched in a tree 50 feet above sea level. Directly below the heron, a pelican is flying 17 feet above sea level. Directly below them is a trout, swimming 23 feet below sea level.

True or False?

The distance between the heights of the pelican and the trout is 40 feet.

• True

• False

A heron is perched in a tree 50 feet above sea level. Directly below the heron, a pelican is flying 17 feet above sea level. Directly below them is a trout, swimming 23 feet below sea level.

True or False?

The distance between the heights of the pelican and heron is -33 feet.

• True

• False

A heron is perched in a tree 50 feet above sea level. Directly below the heron, a pelican is flying 17 feet above sea level. Directly below them is a trout, swimming 23 feet below sea level.

True or False?

The difference in height between the pelican and the trout is 40 feet.

• True

• False

A heron is perched in a tree 50 feet above sea level. Directly below the heron, a pelican is flying 17 feet above sea level. Directly below them is a trout, swimming 23 feet below sea level.

True or False?

The difference in height between the pelican and the trout is -40 feet.

• True

• False