IM 7th Unit 5 Review

Gavin 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 he first sees the tank, it contains 10 gallons of water. Four minutes later, the tank contains 7 gallons of water. At what rate is the amount of water in the tank changing?

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.

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.

The table shows transactions from five different bank accounts. What is the missing transaction amount from account 2?

• 100

• 80

• 75

• 90

The table shows transactions from five different bank accounts. What is the missing new account balance for account 3?

• 25

• 75

• 175

• -25

The table shows transactions from five different bank accounts. What is the missing old account balance for account 4?

• 64

• -40

• -64

• 40

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

•  $a=-\frac{8}{3}$  

•  $a=-4\ \frac{2}{3}$  

•  $a=-6$  

•  $a=6$  

Solve the equation: $19-b=19.5$  

•  $b=0.5$  

•  $b=-0.5$  

•  $b=38.5$  

•  $b=-38.5$  

Solve the equation: $-0.25=-10c$  

•  $c=-25$  

•  $c=25$  

•  $c=0.025$  

•  $c=-0.025$  

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

•  $x+y$  

•  $x-y$  

•  $x\cdot y$  

•  $\frac{x}{y}$