Are the following statements true or false? 1. ∇f(a, b) is a vector in 3-dimensional space. 2. If f(x, y) has fx(a, b)=0 and fy(a, b)=0 at the point (a, b), then f is constant everywhere. 3. Suppose fx(a, b) and fy(a, b) both exist. Then there is always a direction in which the rate of change of f at (a, b) is zero. 4. fu⃗ (a, b)=||∇f(a, b)||. 5. If u⃗ is perpendicular to ∇f(a, b), then fu⃗ (a, b)=⟨0,0⟩. 6. If u⃗ is a unit vector, then fu⃗ (a, b) is a vector. 7. fu⃗ (a, b) is parallel to u⃗ . 8. The gradient vector ∇f(a, b) is tangent to the contour of f at (a, b).

answer: the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

step-by-step explanation:

the given rate of interest i= 85%

in calculating the monthly payment for a loan with an interest rate compounded monthly, the value of the interest rate per period we use in the formula must be in decimal form.

to convert it in decimal, we divide it by 100, we get

hence, the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

b

step-by-step explanation:

u take $75 minus $60.the anwer/original($75)multiply by 100

idk

step-by-step explanation: