USA quiz · Grade 12
16 practice questions. Tap an answer, then use the list below to study with a parent or teacher.
Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.
Answer: linear equations, systems, and linear functions
Isolate variables cleanly.
Answer: 5
Add 7, divide by 3.
Answer: y = −x + 2
y = mx + b.
Answer: 25% increase
(20/80) × 100% = 25%.
Answer: 8
Sum 24 ÷ 3.
Answer: 27
x = 18 × 3/2.
Answer: 10
6-8-10 is a 3-4-5 multiple.
Answer: one output per input
That is the definition of a function.
Answer: average (sum divided by count)
Outliers pull the mean.
Answer: middle value in an ordered list
For an even count, average the two middle numbers.
Answer: most frequent value
A set can have more than one mode.
Answer: max − min
It is sensitive to outliers.
Answer: a biased sample for “all US teens”
Sampling must match the population you name.
Answer: automatically causation
A lurking variable may drive both.
Answer: how values fall into bins
Watch the bin width.
Answer: sits far from the other data
Investigate before dropping it.
Pick the next article in this topic — that is how a magazine issue is meant to be used.
