Acertain number was increased by 5 then decreased by 3 than halved the result was 0.3 less than the original number

Step-by-step explanation:

         Let x = the number

Then x + 5 = the number increased by 5

    x + 5 - 3 = then decreased by 3

½(x + 5 - 3) = then halved

      x - 0.3 = 0.3 less than the number

Check:

½(2.6 + 5 - 3) = 2.6 - 0.3

          ½(4.6) = 2.3

               2.3 = 2.3

OK.

2 over 5

step-by-step explanation:

the 2: 3 ratio is the length of the ac segment to the cb segment total length. this implies that the ratio between segment ac length and segment ab length is 2: 5. point c is 2/5 from a to b, so the required fraction is 2/5.

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!