Mr shah is working out the cost of the electricity he used in April Mr Shah has to pay
20p for each of the first 70 units used in April
and 10p for each of all the other units used in April.
Work out the total cost of the electricity he used in April.

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

What’s the answer ? use the picture to see the problem

Stacey filled her 1/2 cup of measuring cup seven times to have enough flour for a cake recipe how much flour does the cake recipe calls for