Answer:
⇒ The given quadratic equation is x2−kx+9=0, comparing it with ax2+bx+c=0
∴ We get, a=1b=−k,c=9
⇒ It is given that roots are real and distinct.
∴ b2−4ac>0
⇒ (−k)2−4(1)(9)>0
⇒ k2−36>0
⇒ k2>36
⇒ k>6 or k<−6
∴ We can see values of k given in question are correct.
$495.28 I think I'm not sure if I'm right.
Answer: 21:84
Explanation:
84-63=21, and then just do 21:84 lol
She owned 7 blue pens
21:7
She has 28 pens
Answer:
8 months
Step-by-step explanation:
3/4 of a tube per month = 1.5 tubes for two months = 3 tubes for four months.
Double the 3 tubes for four months to get 6 tubes for 8 months.
