Final answer:
To estimate the height of Yolanda's sunflower plant at the end of August, round the initial height (64.36 cm) and the growth (18.4 cm) to the nearest whole numbers, add them together, and the result is 82 centimeters.
Step-by-step explanation:
The student is asking to estimate the height of Yolanda's sunflower plant at the end of August by rounding each value to the nearest whole number. To answer the student's question, we start by rounding the initial height of the plant in July, which is 64.36 centimeters, to the nearest whole number. We round 64.36 to 64 centimeters. Next, we round the amount the plant grew in August, which is 18.4 centimeters, to the nearest whole number. We round 18.4 to 18 centimeters.
To estimate the total height of the plant at the end of August, we add the two rounded values together:
64 cm (initial height rounded) + 18 cm (growth rounded) = 82 cm (estimated height at the end of August).
The estimated height of Yolanda's plant at the end of August is therefore 82 centimeters, so the correct answer is (a) 82 cm.