To find about how wide a river

You're a new engineer reviewing length measurements from a land surveying project.  You're suspicious about a length measurement recorded as 300 ft.  With no decimal point or notation, you're not sure whether or not the two trailing zero's are significant.  You inquire with the survey crew who performed the measurement and found that the recorded value was taken by experienced surveyors using an instrument accurate to two-tenths of a foot and calibrated the morning of the survey. Based on the information you have, which of the following scientific notation expressions would best represent the accuracy of the length measurement? Group of answer choices 3.00E2 ft 3E2 ft 3.0E2 ft

Explain why the river channel in the lower course tends to be wider than in the upper course.

i need the answer quickly