The height of a firework is modeled by , where is in metres and is in seconds. The firework reaches its maximum height of m at s.
the values of the constants and .
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The height of a firework is modeled by , where is in metres and is in seconds. The firework reaches its maximum height of m at s.
the values of the constants and .
The severity of rockbursts in a mine is measured on a local magnitude scale, with values usually ranging from to , where represents the highest severity.
For one mining site, the expected annual number, , of rockbursts reaching at least magnitude is modeled by , where . At this site, there are on average rockbursts per year with a magnitude of or greater.
The model is alternatively written as .
The expected return period in years between rockbursts with magnitude at least is .
The largest rockburst ever recorded at this site had magnitude .
The area covered by an invasive plant in a pond is modelled by the function, , where is a constant and represents the time in weeks since the beginning of the survey. It is observed that the area covered is 384 m after 6 weeks.
An arch is modelled by . The arch has height when , meets the ground at , and has a maximum with -coordinate .
(c) Find the other -intercept of the model.
Consider the quadratic function .
(b) Find the complex roots of the equation in the form using the quadratic formula.
(c) Rewrite this quadratic function by completing the square, expressing it in the form .
(a) the value of .
(b) the value of .
(c) Assuming , the possible interval of values for .
(d) the expected time interval, rounded to the nearest year, between the occurrence of a magnitude rockburst and the next rockburst of at least that magnitude.
(a) the value of .
(b) the meaning of within this context.
(c) the time required for the area to reach .
(a) the value of .
(b) the values of and .
(a) the discriminant, , of this quadratic function.