An arborist examined trees in an orchard to see if they were infected with a virus. 9 out of 90 trees were infected with the virus. what percentage of the trees were infected? write your answer using a percent sign (%)

10%

Step-by-step explanation:

percentage of the trees were infected=9/90*100=10%

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 -