A school entered 15 pupils for a mathematics O level examination. The mean mark
for the 15 pupils was 56. Thc 5 wcakest pupils had a mcan mark of 24. Calculate the
mean mark of the other 10 pupils.

idek

step-by-step explanation:

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answer: d.) the total number of protons and neutrons is 15

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answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft