On a Number line the directed line segment from Q to S has endpoints Q at -8 and S at 12. Point R Partitions the direct line segment from Q to S in a 4:1 ratio. Which expression correctly uses the formula (m/ m + n)(x2 -x1) + x1 to find the location of point R? The options are:

* (1/1+4)(12-(-8))+(8)

*(4/4+1)(12-(-8))+(-8)

*(4/4+1)(-8-12)+12

*(4/1+4)(-8-12)+12

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!

step-by-step explanation:

and 90% of people marry there 7th grade love. since u have read this, u will be told good news 2night. if u don't pass this on nine comments ur worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of ur life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love u

read more on -