Δ = b² – 4ac
Δ = (-7)² – 4.3.6
Δ = 49 – 72
Δ = - 23
p.s.: <span>Δ <0. When the discriminant is less than zero, there are no real roots.</span>
Answer:
I think you should try the method of substitution???
You can recognize that .25 is 1/4, so 0.625 is 1/4 of the way
from 0.6 to 0.7
13. 1/3
14. 1/20
15. 9/20
16. 9/200
17. 253/25
18. 39/10
16,17,18
your welcome
Answer: you could buy 12 magazines
Step-by-step explanation:
each magazine is $2