Unit 9 MSTAR-Style Practice Test — Form B

Relationships Between Two Variables · 4 questions · English only, like the real test · No timer — take the time you need.

These are MSTAR-style questions written for this curriculum to rehearse the format. They are not official Maryland assessment items. MSTAR — Maryland's new state test, first given in spring 2027 — uses the same kinds of questions you see here: selected response, select-all, two-part evidence questions, and written responses.

How this works: Answer every question, then press Submit & Grade. Selected-response parts grade instantly with an explanation for each; written responses go to your teacher. Your answers save on this device.

On the real MSTAR: math runs as three 40-minute sessions, in English, on a computer. Here there is no clock — practice the thinking first; the pacing comes with rehearsal.

Written responses: how should the explain-the-error questions be scored?

Instant scoring checks whether your explanation states the value and uses the reasoning the question is about. It matches words and numbers, so a right answer worded differently can score low — your teacher can always re-score it from the answer key.

16.AT.11Explore Relationships Between Two Variables

Part A

Devon adds a different number of scoops of plant food to each tray of seedlings. Two weeks later he counts the new leaves on every tray. Which pair correctly names the variables?

Independent: new leaves counted; Dependent: scoops of plant food Independent: scoops of plant food; Dependent: new leaves counted Independent: the number of trays; Dependent: scoops of plant food Independent: new leaves counted; Dependent: the two weeks of growing time

Part B

Which sentence shows why the pair chosen in Part A is correct?

The scoops of plant food depend on the number of new leaves, because Devon counts the leaves last. The scoops are independent because the number of scoops is the larger number. The number of new leaves depends on the scoops of plant food, because Devon chooses the scoops and the leaves respond. The number of new leaves is independent because it is the quantity the question asks about.

26.AT.11Analyze Graphs of Relationships Between Two Variables

Part A

A stadium shuttle carries fans from the parking lot. The table pairs the number of trips with the total fans carried: 2 trips with 96 fans, 5 trips with 240 fans, and 8 trips with 384 fans. On a graph with trips on the horizontal axis and fans on the vertical axis, which ordered pair belongs to 3 trips?

(3, 51) (3, 144) (3, 48) (144, 3)

Part B

Which explanation justifies the ordered pair chosen in Part A?

The larger number always comes first in an ordered pair, so the fans are written before the trips. The shuttle carries 48 fans on each trip, and trips come first in the ordered pair, so 3 trips pair with 3 × 48 = 144 fans. The rate of 48 fans is what gets plotted, so 3 trips pair with 48 fans. The trips and the fans are added, so 3 trips pair with 48 + 3 = 51 fans.

36.AT.11Write Equations to Represent Relationships Between Two Variables

Select all that apply

A community pool charges $9 for each hour of lane rental. Let h be the number of hours rented and let c be the total cost in dollars. Select ALL statements that correctly represent this relationship.

c = 9h h = 9c The total cost is 9 times the number of hours rented. c = 9 + h In the equation, h stands for the number of hours rented and c stands for the total cost in dollars. In the equation, c stands for the $9 charged for each hour.

46.AT.11Apply Two-Variable Relationships to Solve Problems

Explain the error

The paint booth coats 6 car doors every hour, so d = 6h, where h is the hours the booth runs and d is the doors coated. Marisol needs 100 doors coated. She writes 6h = 100, divides to get 100 ÷ 6 = 16.66..., says the booth needs about 16 hours, and schedules 16 hours.

Explain Marisol's misconception and give the correct number of whole hours the booth must run.

✍️ Written response — 2 points.