4 jars of mustard and 3 jars of beetroot have a total mass of 930 grams. 5 jars of mustard have a total mass of 600 grams. Work out the total mass of 3 jars of mustard and 2 jars of beetroot.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.

Subtract and simplify. (-y^2 – 4y - 8) – (-4y^2 – 6y + 3) show how you got the answer if your answer is right i will mark you