3. Write each increase as a percent. Illustrate each answer with a number line. a) The price of a house increased from \( \$ 210000 \) to \( \$ 225000 \). b) The elastic stretched from 10 cm to 13 cm .

To find the percent increase for the house price, you subtract the original price from the new price: \( 225000 - 210000 = 15000 \). Then, divide that by the original price: \( 15000 / 210000 = 0.0714 \). Multiply by 100 to convert to a percentage, which gives you approximately a 7.14% increase. For the elastic, subtract the original length from the new length: \( 13 - 10 = 3 \). Divide this by the original length: \( 3 / 10 = 0.3 \). When multiplied by 100, it results in a 30% increase. On a number line, you can represent the house price by marking 210,000 and then moving to 225,000, demonstrating the increase. For the elastic, you’d mark 10 cm and then show the movement to 13 cm, visually illustrating the difference!