Students must take an AP Sciences exam their senior year: 25% take AP Chemistry, 35% take AP Physics, 30% take AP Environmental Science and the remaining seniors take AP Biology. Of those who take AP Chemistry, 45% get accepted to their first-choice college, compared with 55% who take AP Physics, 20% who take AP Environmental Science, and 30% who take AP Biology. Use the partially completed tree diagram to fill in the indicated labels.

idk

step-by-step explanation:

he has now walked a total of what?

if i know what this is maybe i can

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -