Ask question

Ask question

All categories

3 years ago

14

PLEASE HELP!!! I only have a limited amount of time left to answer these questions and I do not understand any of them.

1 answer:

dusya [7]3 years ago

4 0

Her vertical position is described by y(t). She reach the ground when y(t) = 0 so:

$y(t)=0\\\\-16t^2+100=0\quad|-16t^2\\\\100=16t^2\quad|:16\\\\t^2=6.25\quad|\sqrt{(\dots)}\\\\\boxed{t=2.5}$

She reach the ground after 2.5 seconds and she will be:

$x(2.5)=8\cdot2.5=\boxed{20}$ (meters) from the cliff.

You might be interested in

una caja contiene 2 bolitas blancas y 3 blancas .la probabilidad de que la primera extraída sea blanca y la segunda sea negra ,

zzz [600]

si cinco son blancas como va a ver una negra ?

6 0

3 years ago

A new car is purchased for \$47,000$47,000 and over time its value depreciates by one half every 4.5 years. What is the value of

Lady_Fox [76]

It’s is 47,027.5 you need to add

3 0

3 years ago

Can someone explain how to do this? i know the answer but i don't know how to work it out. Find the absolute mean deviation for

harina [27]

Step-by-step explanation:

The mean absolute deviation is:

MAD = ∑ᵢ₌₁ⁿ│xᵢ − μ│/ n

First, find the mean.

μ = (x + 2x + 3x + 4x) / 4

μ = 2.5x

Now find the mean absolute deviation:

MAD = (│x − 2.5x│+│2x − 2.5x│+│3x − 2.5x│+│4x − 2.5x│) / 4

MAD = (│-1.5x│+│-0.5x│+│0.5x│+│1.5x│) / 4

MAD = (1.5x + 0.5x + 0.5x + 1.5x) / 4

MAD = (4x) / 4

MAD = x

6 0

3 years ago

Which blood type was donates by the largest percent of people?

sergeinik [125]

The answer is o+ Hope this helped.

4 0

4 years ago

You are dealt two cards successively (without replacement) from a shuffled deck of 52 playing cards. find the probability that b

Rasek [7]

Answer:

$\frac{25}{102}$ .

Step-by-step explanation:

Total number of cards in a deck = 52

number of black cards in a deck = 26

Find the probability that both cards are black (without replacement).

Therefore, both events are dependent.

The probability of first card is black = $P_{1}=\frac{26}{52}$

the probability of second card is black = $P_{2}=\frac{25}{51}$

$P=\frac{26}{52}$ × $=\frac{25}{51}$

= $\frac{1}{2}$ × $\frac{25}{51}$

= $\frac{25}{102}$

The probability that both cards are black is $\frac{25}{102}$ .

8 0

3 years ago