Please show work. these are practice problems, I need help understanding how to solve these problems. ill give brainliest

I'll do a couple to show the process.

Step-by-step explanation:

Number 5:

    f(1) this means to plug 1 in for x in the equation f(x)

   This yields 3(1) - 7 = -4

    g(2) this means to plug in 2 for x in the equation g(x)

    This yields 2^2 + 5 = 9

  Then it asks for f(1) * g(2)

    This is the same as -4 * 9 = -36

Number 6:

    g(-3), plug in -3 for x

    This gives (-3)^2+5 = 14

    g(1), plug 1 in for x

    This gives 1^2+5 = 6

 Then add the two:

    14 + 6 = 20

HOPE THIS HELPS!