Viết công thức hàm số y=f(x) biết rằng y tỉ lệ nghịch với x theo hệ số a=12 a) Tìm x để f(x)=4;f(x)=4
b) Chứng tỏ rằng f(-x)=-f(x)

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute:

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

lo98765432wqasdfghjkloi87654567890

step-by-step explanation: