15n+21
We dont know how much square peter buys and per square cost 15$. So thats mean peter buys 15n$
And the total delivery charge 21$
Its cost 15n+21
Answer:
{2, 0, - 1, - 2}
Step-by-step explanation:
We have to find the domain of the relation {(2,8), (0,8), (-1,5), (-1,3), (-2,3)}.
Now, this is not a function and this is relation because there are two values of y {i.e. y = 5 and y = 3} for a single corresponding value of x {i.e. x = - 1}.
Now, the domain of the relation, which means the x-values of the given relation are {2, 0, - 1, - 2}. (Answer)
If the range is{25,64}
it means. F(K) =25,64 for some value of k
for 25
25=k²+2k+1
k²+2k-24=0
k²+6k-4k-24=0
K(k+6)-4(k+6)=0
(k-4)(k+6)=0
k=-6,+4
for 64
k²+2k-63=0
k²+9k-7k-63=0
k(k+9)-7(k+9)=0
(k-7)(k+9)=0
k=-9,+7
so the domain of F(k)={ -9 , -6 , 4 , 7 }