is a. Write each decrease as a percent. Illustrate each answer with a number line. is The price of gasoline decreased from \( 79.9 \mathrm{C} / \mathrm{L} \) to \( 75.9 \mathrm{C} / \mathrm{L} \). b) The area of rain forest in Jamaica decreased from 128800 ha in 1981 to 122000 ha in 1990 .

a) To find the decrease in price as a percent, we can use the formula: \[ \text{Percent decrease} = \left( \frac{\text{Original price} - \text{New price}}{\text{Original price}} \right) \times 100 \] Given: Original price = \( 79.9 \mathrm{C} / \mathrm{L} \) New price = \( 75.9 \mathrm{C} / \mathrm{L} \) Substitute the values into the formula: \[ \text{Percent decrease} = \left( \frac{79.9 - 75.9}{79.9} \right) \times 100 \] \[ \text{Percent decrease} = \left( \frac{4}{79.9} \right) \times 100 \] \[ \text{Percent decrease} \approx 5.01\% \] Therefore, the price of gasoline decreased by approximately 5.01%. b) To find the decrease in the area of the rain forest in Jamaica as a percent, we can use the same formula as in part a: \[ \text{Percent decrease} = \left( \frac{\text{Original area} - \text{New area}}{\text{Original area}} \right) \times 100 \] Given: Original area = 128800 ha New area = 122000 ha Substitute the values into the formula: \[ \text{Percent decrease} = \left( \frac{128800 - 122000}{128800} \right) \times 100 \] \[ \text{Percent decrease} = \left( \frac{6800}{128800} \right) \times 100 \] \[ \text{Percent decrease} \approx 5.28\% \] Therefore, the area of the rain forest in Jamaica decreased by approximately 5.28%.