How to calculate percent error with uncertainty?

26 is 80% of what number

A t-shirt normally sold for £30 has 15% off. find the selling price of the t-shirt

A culture started with 6,000 bacteria. After 6 hours, it grew to 7,200 bacteria. Predict how many bacteria will be present after 17 hours. Round your answer to the nearest whole number.

A hemisphere (a half sphere) has a diameter of 10 centimeters. Find the volume of the hemisphere. Round to the nearest tenth.

Find the overall percent change compared to the original amount: A shirt originally costing $20 is marked with a 15% discount.

Lamar is fertilizing his garden. The garden is in the shape of a rectangle. Its length is 16 feet and its width is 13 feet. Suppose each bag of fertilizer covers 26 square feet. How many bags will he need to cover the garden?

Suppose you have 40 blue socks and 40 brown socks in a drawer. How many socks must you take from the drawer without looking to be sure of getting a pair of the same color?

What does it mean when a line changes and you translated

Three of the angles of quadrilateral are 100 degrees, 104 degrees and 44 degrees. What is the size of the 4th angle

Eugene typed 525 words in 15 minutes. At that rate, how many words would he type in 8 minutes?