Các tập nào sau đây là không gian tuyến tính trongRna)E={x= (x1,...,xn)∈Rn:x1=x2=···=xn= 1}b)E={x= (x1,...,xn)∈Rn:x1+x2= 1}c)E={x= (x1,...,xn)∈Rn:x1>0}d)E={x= (x1,...,xn)∈Rn:x1>0,x2>0,..., xn>0}

srry idk

step-by-step explanation:

351°f

step-by-step explanation:

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25

80° is the measure of gh

step-by-step explanation:

circle f is congruent to circle j

we have two circle with center f and j.

both circles are congruent. the radius of the circle would be equal.

see the attachment for the circle.

we are given ∠efd ≅ ∠gjh

therefore, arc (ed) = arc (gh)     (∴ circle f is congruent to circle j)

but ∠dfe=80°=arc (ed)

therefore, arc (gh) = 80°

thus, 80° is the measure of gh