I need to know what the answer to this question is

A

Step-by-step explanation:

8*a*10⁻²=b*10⁻³

8*a*10⁻²=10b*10⁻²

cancel out 10⁻² by dividing both sides by it.

8a=10b

Use trial error.

A. a=3.1 and b=2.5

   8*3.1=24.8 (round up to 25)

   10*2.5=25

Option A is closest. I tried all options.

x + 3y = 460 ( this is the statement for total amount of money)

x + y = 100 ( this is the statement for number of tickets sold)

now use either equation to solve for y, it just happens that x + y = 100 is the easiest to do this with,

this gives use the answer,

y = 100 - x

now plug this into our money equation and you get,

5x + 3(100-x) = 460

now simplify,

5x + 300 - 3x = 460

2x = 160

x = 80

Therefore, 80 ticketStep-by-step explanation:

table 3 represents a direct variation function. : )

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!