Pre-algebra ACT Practice

Flashcard
•
Mathematics
•
9th - 10th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the formula for calculating the average (arithmetic mean) of two numbers?
Back
The average of two numbers a and b is calculated as: \( \text{Average} = \frac{a + b}{2} \)
2.
FLASHCARD QUESTION
Front
If the average of two numbers is 4x and one number is y, how do you find the other number?
Back
The other number can be found using the formula: \( \text{Other number} = 2(4x) - y = 8x - y \)
3.
FLASHCARD QUESTION
Front
What is a percentage?
Back
A percentage is a fraction expressed as a part of 100. It is often used to compare relative sizes.
4.
FLASHCARD QUESTION
Front
How do you calculate the original price after a discount?
Back
To find the original price (P) after a discount, use the formula: \( P = \frac{\text{Final Price}}{1 - \text{Discount Rate}} \)
5.
FLASHCARD QUESTION
Front
What is the median of a set of numbers?
Back
The median is the middle value in a list of numbers sorted in ascending order. If there is an even number of observations, the median is the average of the two middle numbers.
6.
FLASHCARD QUESTION
Front
How do you calculate the percentage of a part compared to a whole?
Back
To calculate the percentage, use the formula: \( \text{Percentage} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100 \)
7.
FLASHCARD QUESTION
Front
What is the slope-intercept form of a linear equation?
Back
The slope-intercept form is given by: \( y = mx + b \) where m is the slope and b is the y-intercept.
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