Quiz about Rational Number Arithmetic: End-of-Unit Assessment (B)

Question 1

A sunken ship is resting at 3,000 feet below sea level. Directly above the ship, a whale is swimming 1,960 feet below sea level. Directly above the ship and the whale is a plane flying at 8,500 feet above sea level.

Select the true statement.

Accepted Answer

The distance between the heights of the whale and the ship is 1,040 feet.

Answer

The distance between the heights of the whale and the plane is -10,460 feet.

Answer

The difference in height between the whale and the plane is 10,460 feet.

Answer

The difference in height between the whale and the ship is -1,040 feet.

Question 2

Francesca walks up to a tank of water that can hold up to 20 gallons. When it is active, a drain empties water from the tank at a constant rate. When she first sees the tank, it contains 10 gallons of water. Four minutes later, the tank contains 7 gallons of water. How many more minutes will it take for the tank to drain completely? Select all that apply.

Accepted Answer

28/3 minutes

Accepted Answer

9 1/3 minutes

Answer

-8 minutes

Answer

21/4 minutes

Answer

21/2 minutes

Question 3

Devyn walks up to a tank of water that can hold up to 20 gallons. When it is active, a drain empties water from the tank at a constant rate. When she first sees the tank, it contains 10 gallons of water. Four minutes later, the tank contains 7 gallons of water. How many minutes before Devyn arrived was the water tank completely full? Select all that apply.

Accepted Answer

40/3 minutes

Accepted Answer

13 1/3 minutes

Answer

30/4 minutes

Answer

15 minutes

Answer

-13 minutes

Question 4

Solve the equation: $$\frac{2}{3}a=-4$$

Accepted Answer

a=-6

Answer

a=-8/3

Answer

a=-4 2/3

Answer

a=6

Question 5

Solve the equation: 19-b=19.5

Accepted Answer

b=-0.5

Answer

b=0.5

Answer

b=38.5

Answer

b=-38.5

Question 6

Solve the equation: $$-0.25=-10c$$

Accepted Answer

c=0.025

Answer

c=-25

Answer

c=25

Answer

c=-0.025

Question 7

Which expression has a negative value?
$$y=-\frac{17}{4},\ \ x=-\frac{17}{8}$$

Accepted Answer

x+y

Answer

x-y

Answer

xy

Answer

x/y

Question 8

A heron is perched in a tree 75 feet above sea level. Directly below him, a pelican is flying 15 feet above sea level. Directly below the birds is a trout, swimming 15 feet below sea level.

Select all the true statements.

Accepted Answer

The difference in height between the pelican and the heron is -60 feet.

Accepted Answer

The distance between the heights of the heron and the trout is 90 feet.

Accepted Answer

The difference in height between the pelican and the trout is 30 feet.

Answer

The distance between the heights of the pelican and heron is -60 feet.

Answer

The difference in height between the pelican and the heron is 60 feet.

Question 9

Calculate the value of the expression: $$-6 imes\frac{2}{3}$$

Accepted Answer

-4

Answer

-18/3

Answer

6

Answer

4

Question 10

The absolute value of a number is its distance from ___on the number line.

Accepted Answer

0

Answer

100

Answer

10

Answer

-10

Rational Number Arithmetic: End-of-Unit Assessment (B)

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