Consider a function f(x, y) at the point (6,6). At that point the function has directional derivatives of 4/sqrt(85) in the direction (parallel to) (7,6) and 2/sqrt(85) in the direction (parallel to) (6,7) the gradient of f at the point (6,6) is? (,)

The spring the owner of a sporting good store decreases the price of winter gloves from $10 to $8 each increases the price of swimming goggles from $8 to $10 without doing the math you think the percent decrease in the price of the gloves the same as the percent increase of the goggles explain why or why not

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Me i’m stuck on all these questions besides the two bottom ones