There are 360 students in Year 7 Each student studies one of French or German or Spanish.

Of these 360 students

study French
the number who study French : the number who study Spanish = 8 : 9
12 boys study German

Of the students who study German, what percentage are boys?
You must show your working.

The image of the point (-6, -2)under a translation is (−7,0). find the coordinates of the image of the point (7,0) under the same translation.

Find the area of the unshaded square

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.