Answer:
The volume of the sandbox is 70 cubic feet
Step-by-step explanation:
To find the volume, simply multiply all of the dimensions by each other.
7ft * 5ft * 2ft = 70 ft^3
It's C, just look at where the points are.
Answer:
The percent of error in her measurement is 1.3%
Step-by-step explanation:
we know that
The circumference of a circle is equal to

where
D is the diameter
we have

assume

substitute
----> This value represent the 100% (theoretical value)
Find the difference between the theoretical value and the measured value
Find the percentage by proportion

78 is the significant figure because in maths 0's are not considered significant. Read more into significant figures to help you out.