there are my vans on a road there are 5 people in each van write expression in terms of y for the total numbers!

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Atextile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. the company wishes to test the hypothesis upper h subscript 0 baseline colon mu equals 12 against upper h subscript 1 baseline colon mu less-than 12 using a random sample of n equals 4 specimens. calculate the p-value if the observed statistic is x overbar equals 11.8. round your final answer to five decimal places (e.g. 98.76543).

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle