0.5 (x to the fourth power - 7) +18

(0.5 • x to the fourth power) + 3.5+ 18

Or 21.5 + (0.5 • x to the fourth power)

In mathematical expression, You can write it as:

= 0.5 (x⁴ - 7) + 18

Now, Apply the distributive property and open the elements of parentheses:
= 0.5x⁴ - 3.5 + 18
= 0.5x⁴ + 14.5

In short, Your Final Answer would be:  0.5x⁴ + 14.5

Hope this helps!

I’m pretty sure the slope would be 1 since the x and y values increase by 1