There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is
5
7
.
There are 30 red marbles in the bag and each is equally likely to be chosen.
Work out how many marbles in total there must be.

4sqrt5

step-by-step explanation:

the base has dimensions of 8 x 4, so the diagonal is 64 + 16 square rooted or 4sqrt5.

i hope this is what you were looking for.

see attached graph

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