Proportionality Retest 23-24

Front

What is proportionality?

Back

Proportionality refers to the relationship between two quantities where their ratio remains constant. If one quantity increases, the other increases in a way that maintains the same ratio.

Front

How do you convert inches to centimeters?

Back

To convert inches to centimeters, multiply the number of inches by 2.5. For example, 27 inches is 27 x 2.5 = 67.5 cm.

Front

What is percent decrease?

Back

Percent decrease is a measure of how much a quantity has decreased relative to its original value, expressed as a percentage. It is calculated using the formula: ((original value - new value) / original value) x 100.

Front

How do you calculate the total cost including tax?

Back

To calculate the total cost including tax, first find the subtotal (sum of all items), then multiply the subtotal by the tax rate (as a decimal) and add it to the subtotal.

Front

What is the formula for finding the weight of multiple items?

Back

To find the weight of multiple items, use the formula: Total Weight = (Weight of one item) x (Number of items).

Front

What is a linear equation?

Back

A linear equation is an equation that makes a straight line when graphed. It can be written in the form y = mx + b, where m is the slope and b is the y-intercept.

Front

How do you find the total amount spent on multiple items?

Back

To find the total amount spent on multiple items, multiply the price of each item by the quantity purchased and sum all the amounts.

Front

What is the relationship between y and x in the equation y = 5x?

Back

In the equation y = 5x, y is directly proportional to x. For every unit increase in x, y increases by 5 units.

Front

How do you determine the weight of a smaller quantity based on a known total weight?

Back

To determine the weight of a smaller quantity, set up a proportion based on the known total weight and the number of items. For example, if 15 bags weigh 45 pounds, then 7 bags weigh (7/15) x 45 pounds.

Front

What is the significance of the sales tax rate?

Back

The sales tax rate is a percentage added to the price of goods and services, which is collected by the seller and paid to the government. It affects the total cost of purchases.