The usual toll charge over a bridge is $1.50. If you purchase a special sticker for $10.50, the charge is $0.80. At least how ma
ny trips through the tunnel are needed before the sticker would cost less than the toll charge?
1 answer:
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Answer:
Step-by-step explanation:
Given the expression:
We can re-write the answer as:
The answer is irrational because the sum of a rational number and irrational number is an irrational number.
<u>The correct option is B.</u>
Answer:
Therefore the two values required are 2.08 and -11.08.
Step-by-step explanation:
i) f(x) = + 10x - 12 is a quadratic equation and a quadratic equation will have two roots whose values when substituted in to the given quadratic equation will give the value.
ii) The question is therefore essentially asking us to find the roots of the given quadratic equation.
This can be done by equating the given quadratic equation to zero and then solving the equation for its roots.
∴ + 10x -12 = 0 ⇒ x = (-10 ±
) ÷ 2
= (-10 ± 12.166)÷2 = 2.08, -11.08
Therefore the two values required are 2.08 and -11.08