Help me to do this please

This is a classic example when the parts of the equation has been confused.

Step-by-step explanation:

Here the slope, which is the change in y for every change in x, is 3, and the y-intercept, is 5. The form of a line is y=mx+b. Jacob confused these two and chose D incorrectly, which has the form y=bx+m.

x > 1.3

step by step:

8.5−0.9x> 9.8−1.9x

step 1: simplify both sides of the inequality.

−0.9x+8.5> −1.9x+9.8

step 2: add 1.9x to both sides.

−0.9x+8.5+1.9x> −1.9x+9.8+1.9x

1x+8.5> 9.8

step 3: subtract 8.5 from both sides.

1x+8.5−8.5> 9.8−8.5

1x> 1.3

step 4: divide both sides by 1.

1x/1 > 1.3/1

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50