An iron bar is heated. its length, l, in millimetres can be modelled by a linear function, l= mt + c,

where t is the temperature measured in degrees celsius (°c).

at 150°c the length of the iron bar is 180 mm.

Find x to the nearest hundredth place

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?