Step-by-step explanation:
h(t) = -5t² + 20t + 18
this is a parabola (the curve an object follows when thrown up into the air and then falling back down).
and as such it will most likely have 2 solutions (one for when going up, and one for when falling back down again).
33 = -5t² + 20t + 18
15 = -5t² + 20t
-3 = t² - 4t
t² - 4t + 3 = 0
the solution of such a quadratic equation is
t = (-b ±sqrt(b² - 4ac))/(2a)
in our case
a = 1
b = -4
c = 3
t = (4 ±sqrt(16 - 4×1×3))/(2×1) = (4 ±sqrt(16-12))/2 =
= (4 ±sqrt(4))/2 = (4 ± 2)/2
t1 = (4+2)/2 = 6/2 = 3
t2 = (4-2)/2 = 2/2 = 1
the object reaches the height of 33 m first after 1 second (while going up), and then again after 3 seconds (while falling down again).
Your answer would be 45 and 1/3
52 Feet under sea level. 13 times 4 is 52, and since he is going underwater it is negative.
The first answer is a letter c - normal
distribution. The normal distribution is the most significant
and most generally used distribution in statistics. It is also known as the Gaussian or standard
normal distribution, is the <span>probability
distribution<span> that plots all of its values in an
even fashion, and most of the results are positioned around the probability's
mean. Values are equally likely to plot either above or below the mean. And the
second answer is letter d - sampling distribution. In statistics, it is the
probability distribution of a given statistic centered on a
random sample. Sampling distributions are significant
in statistics because they deliver a major simplification to the statistical
inference.</span></span>
Answer:
155
Step-by-step explanation:
= (15)x10+5
= 150+5
= 155
