Alaptop computor sells for $850. the sales tax is 7%.

whats the total cost of the lapp top?

a. $850.07
b. $850.70
c. $909.50
d. $920

Me. i can't figure out this question. give an explanation too. .

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.

If f(x) = 5х – 2 and g(x) = 2х + 1, find (f – g)(x).