Please help with 2 and 3

Mathematics

1 answer:

Angelina_Jolie [31]2 years ago

3 0

Answer:

2)
Original Mean: 867
Original Median: 543

New Mean: 790
New Median: 400

3)
Original Mean: 22.6
Original Median: 22.5

New Mean: 21.6
New Median: 22

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The distance between the point (-3,4) and the point of origin

pickupchik [31]

Answer:

Step-by-step explanation:

1) origin point is (0;0);

2) the required distance is:

$d=\sqrt{(-3-0)^2+(4-0)^2} =5.$

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3 years ago

A food packet is dropped from a helicopter and is modeled by the function f(x) = −15x2 + 6000. The graph below shows the height

melisa1 [442]

General Idea:

Domain of a function means the values of x which will give a DEFINED output for the function.

Applying the concept:

Given that the x represent the time in seconds, f(x) represent the height of food packet.

Time cannot be a negative value, so

$x\geq 0$

The height of the food packet cannot be a negative value, so

$f(x)\geq 0$

We need to replace $-15x^2+6000$ for f(x) in the above inequality to find the domain.

$-15x^2+6000\geq 0 \; \; [Divide \; by\; -15\; on\; both\; sides]\\ \\ \frac{-15x^2}{-15} +\frac{6000}{-15} \leq \frac{0}{-15} \\ \\ x^2-400\leq 0\;[Factoring\;on\;left\;side]\\ \\ (x+200)(x-200)\leq 0$

The possible solutions of the above inequality are given by the intervals $(-\infty , -2], [-2,2], [2,\infty )$ . We need to pick test point from each possible solution interval and check whether that test point make the inequality $(x+200)(x-200)\leq 0$ true. Only the test point from the solution interval [-200, 200] make the inequality true.