I need help with this question i will need full working out could u help?
1 answer:
Answer:
Total charge=
Step-by-step explanation:
The basic plan of Jo's mobile phone costs which includes
150 free minutes and 13p for each additional minute
150 free texts and 15p for each text
Since Jo made 170 minutes of calls, she exceeded the free minutes and had to pay
170 - 150 = 20 additional minutes, worth 13*20/100=
She also sent 182 texts, 182 - 150 = 32 in excess, worth
So the total charge for the month was
Total charge=
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Our discriminant is 0 so, has one real root.
Option C is correct.
Step-by-step explanation:
we need to find the discriminant and the number of real roots for the following equation:
The discriminant is found by using square root part of quadratic formula:
where b =12, a=4 and c=9
Putting values:
To find out the number of real roots using discriminant we have following rules:
- if discriminant b^2-4ac >0 then 2 real roots
- if discriminant b^2-4ac =0 then 1 real root
- if discriminant b^2-4ac <0 then no real roots
Since our discriminant b^2-4ac is 0 so, has one real root.
Option C is correct.
Keywords: discriminant
Learn more about discriminant at:
#learnwithBrainly