42.86% error was in the scientist's estimation.
Step-by-step explanation:
Given data;
Approx amount = 4 ml
Exact amount needed = 7 ml
Percentage error = 

42.86% error was in the scientist's estimation.
Keywords: error, percentage
Learn more about percentages at:
#LearnwithBrainly
Answer:She can buy 5 goldfish.
Step-by-step explanation: If you divide the amount of money she has to spend by the cost of the goldfish;
$11/5 = 5.5
Since she can’t buy 5 and a half goldfish, she can only buy 5.
Answer:
r=√(A/π)
r=2.8
Step-by-step explanation:
We want to get (r) alone on one side
A=πr^2
divide each side by π
A/π=r^2
square root each side
√(A/π)=r
r=√(A/π) is the answer to your first question.
now we are given A
r=√((25)/3.14)
put the left side into a calculator
r=2.8216632
round to nearest tenth of a centimeter
r=2.8