If f(x)=3^x+10x and g(x)=5x-3, find (f+g)(x)
a 3^x+15x-3
b 18x-3
c 3^x+5x+3
d 3^x-5x+3

A 3^x+15x-3

Step-by-step explanation:

f(x)=3^x+10x and g(x)=5x-3

(f+g)(x) = 3^x+10x +5x-3

 Combine like terms

           = 3^x +15x -3

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1

15.36 per mile

but forgot to round

i am pretty sure