Can anybody me show my work for these have the correct answer just no work to prove

1.given f(x) = x2 + 2x, find f(a _ 3)
a: a^2-4a+3

2. if f(x0=x/x-3 and g(x)=2x-1, find (f-g)(x)
a: -2x^2+8x-3/x-3

3. if f(x)=x^2+1 and g(x)=1/x, find [f*g](x)
a: 1/x^2 +1

4. which equation best represents a line perpendicular to the graph of x+3y=9?
a: y=3x-1

5. which of the following describes the graphs of 2x+5y=9 and 10x=4y+18?
a: perpendicular

6. write the standard form of an equation of the line parallel to the graph of x-2y-6=0 and passing through a(

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

Ineed with number 6 , explain how to get 1978

An annual marathon covers a route that has a distance of approximately 26 miles. winning times for this marathon are all over 2 hours. the following data are the minutes over 2 hours for the winning male runners over two periods of 20 years each. earlier period 14 12 15 22 13 10 19 13 9 14 20 18 16 20 23 12 18 17 6 13 recent period 7 11 7 14 8 9 11 14 8 7 9 8 7 9 9 9 9 8 10 8 (a) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the earlier period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks. for more details, view how to split a stem.) minutes beyond 2 hours earlier period 0 1 2 (b) make a stem-and-leaf display for the minutes over 2 hours of the winning times for the recent period. use two lines per stem. (use the tens digit as the stem and the ones digit as the leaf. enter none in any unused answer blanks.) minutes beyond 2 hours recent period (c) compare the two distributions. how many times under 15 minutes are in each distribution