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3 years ago

MARKING BRAINLIEST PLS HELP

Mathematics

2 answers:

ladessa [460]3 years ago

8 0

Awnser: -7
explanation : i got it from the guy up there^^

ch4aika [34]3 years ago

5 0

Answer:

-7

Step-by-step explanation:

Domain is simply another way of saying input values. Input values are literally just x values (Any place on the x bar. Range is the same but instead of x values it is for y values.

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"We might think that a ball that is dropped from a height of 15 feet and rebounds to a height 7/8 of its previous height at each

tatyana61 [14]

Answer:

Total Time = 4.51 s

Step-by-step explanation:

Solution:

- It firstly asks you to prove that that statement is true. To prove it, we will need a little bit of kinematics:

y = v_o*t + 0.5*a*t^2

Where, v_o : Initial velocity = 0 ... dropped

a: Acceleration due to gravity = 32 ft / s^2

y = h ( Initial height )

h = 0 + 0.5*32*t^2

t^2 = 2*h / 32

t = 0.25*√h ...... Proven

- We know that ball rebounds back to 7/8 of its previous height h. So we will calculate times for each bounce:

$1st : 0.25*\sqrt{15}\\\\2nd: 0.25*\sqrt{15} + 0.25*\sqrt{15*\frac{7}{8} } + 0.25*\sqrt{15*\frac{7}{8} } = 0.25*\sqrt{15} + 0.5*\sqrt{15*\frac{7}{8} }\\\\3rd: 0.25*\sqrt{15} + 0.5*\sqrt{15*\frac{7}{8} } + 2*0.25*\sqrt{15*(\frac{7}{8} })^2\\\\= 0.25*\sqrt{15} + 0.5*\sqrt{15*\frac{7}{8} } + 0.5*\sqrt{15*(\frac{7}{8} })^2\\\\4th: 0.25*\sqrt{15} + 0.5*\sqrt{15*\frac{7}{8} } + 0.5*\sqrt{15*(\frac{7}{8} })^2 + 2*0.25*\sqrt{15*(\frac{7}{8} })^3 \\\\$

$= 0.25*\sqrt{15} + 0.5*\sqrt{15*\frac{7}{8} } + 0.5*\sqrt{15*(\frac{7}{8} })^2 + 0.5*\sqrt{15*(\frac{7}{8} })^3$

- How long it has been bouncing at nth bounce, we will look at the pattern between 1st, 2nd and 3rd and 4th bounce times calculated above. We see it follows a geometric series with formula:

Total Time ( nth bounce ) = Sum to nth ( $\frac{1}{2}*\sqrt{15*(\frac{7}{8})^(^i^-^1^) } - \frac{1}{4}*\sqrt{15}$ )

- The formula for sum to infinity for geometric progression is:

S∞ = a / 1 - r

Where, a = 15 , r = ( 7 / 8 )

S∞ = 15 / 1 - (7/8) = 15 / (1/8)

S∞ = 120

- Then we have:

Total Time = 0.5*√S∞ - 0.25*√15

Total Time = 0.5*√120 - 0.25*√15

Total Time = 4.51 s

5 0

4 years ago

Teddy is looking for buttons for his snowmen he needs five buttons for each of his snowmen if he has 15 Snowmen and 70 buttons w

Klio2033 [76]

Answer:No, he doesn't have enough buttons. He needs 5 more.

Step-by-step explanation: Do 15×5. Each of the 15 snowmen need 5 each, which equals 75 buttons. Since he has 70 buttons to start off with, he only needs five more buttons.

4 0

3 years ago

PLEASE HELP! WILL MARK BRAINLIEST

omeli [17]

v - 6 ≥ 4

+6 +6

v ≥ 10

Graph: 10 -----------------→ the dot at 10 is filled in because of the "equal to" symbol

********************************************************************************************************

-5x < 15

$\frac{-5x}{-5} > \frac{15}{-5}$ divided by a negative so the symbol flipped

x > -3

Graph: -3 o------------------→ the dot at -3 is NOT filled in because it's NOT "equal to"

********************************************************************************************************

3k > 5k + 12

-5k -5k

-2k > 12

$\frac{-2k}{-2} < \frac{12}{-2}$ divided by a negative so the symbol flipped

k < -6

Graph: ←------------o -6 the dot at -6 is NOT filled in because it's NOT "equal to"

********************************************************************************************************

2t ≤ 4 or 7t ≥ 49

$\frac{2t}{2} \leq\frac{4}{2}$ or $\frac{7t}{7} \geq \frac{49}{7}$

t ≤ 2 or t ≥ 7

Graph: ←------- 2 7 ---------→ the dots at 2 and 7 are filled in

********************************************************************************************************

| n + 2 | = 4

n + 2 = 4 or n + 2 = -4

-2 -2 -2 -2

n = 2 or n = -6

Answer: n = {2, -6}

********************************************************************************************************

| 2x - 7 | > 1

2x - 7 > 1 or 2x - 7 < -1

+7 +7 +7 +7

2x > 8 or 2x < 6

$\frac{2x}{2} > \frac{8}{2}$ or $\frac{2x}{2} < \frac{6}{2}$

x > 4 or x < 3

Graph: ←----------o 3 4 o------------→

********************************************************************************************************

A = {1, 2, 3, 4, 5, 6, 7, 8, 9} B = {2, 4, 6, 8}

A U B = {1, 2, 3, 4, 5, 6, 7, 8, 9} union combines both sets

A ∩ B = {2, 4, 6, 8} intersection includes only those that are in BOTH sets

********************************************************************************************************

P = {1, 5, 7, 9, 13} R = { 1, 2, 3, 4, 5, 6, 7} Q = {1, 3, 5}

P ∩ R ∩ Q = {1, 5}

P ∩ R = {7} disregard 1 & 5 since they are already in P∩Q∩R

R ∩ Q = {3} disregard 1 & 5 since they are already in P∩Q∩R

P ∩ Q = { } disregard 1 & 5 since they are already in P∩Q∩R

P no intersection = {9, 13)

R no intersection = {2, 4, 6}

Q no intersection = { }

If you can't figure out how to draw it based on the information I provided, please see the attached diagram. Note: Usially, you would only identify P, Q, R. I identified the intersections so you would understand why those specific numbers are placed in the designated sections.

4 0

3 years ago

A package contain 4 red 2 green 8 purple n 6 blue wats the probability of eating a purple one n choosing a blue one

Amanda [17]

4+2+8+6 = 20 total

8 purple

so 8/20 reduced to 2/5 chance for a purple

then there will be 19 left

6 blue =

6/19 probability of having a blue one

2/5 * 6/16 = 12/80 reduces to 3/20 probability total

7 0

3 years ago

PLZ!!!!!!!! Help 99 points

inn [45]

Beatrice is incorrect. All of these points are not on the same line because the slope between (-2 , -1) and (1, 0), which are coordinates from each of these pairs above are not equal to 1/2

8 0

4 years ago

Read 2 more answers