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4 years ago

PLEASE HELP 9 AND 10 IM LITERALLY CRYING

Mathematics

1 answer:

tekilochka [14]4 years ago

6 0

Answer:

#10:

burger: $7.50

fries and drink: 2.50

idk about #9 tho sry

Step-by-step explanation:

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If an object is dropped from a height of 144 feet, the function h(t)=-16t^2 +144 gives the height of the object after t seconds.

Vaselesa [24]

If the object hit the ground, then this mean that the height is 0, right?
so solve for it like this:

0= -16t^2+144
-144 = -16t^2
Divide by (-16)
9= t^2
square root both sides
t= 3 or -3
there is no negative time then the object will hit the ground after 3 secs

8 0

3 years ago

Read 2 more answers

Nina and her friends have $40 to

DochEvi [55]

Answer:

2s+5p=40

Step-by-step explanation:

s=sodas

p=popcorn

you can plug in 0 for s or for p to see how many of the other she can get (if you plug in 0 for s you see she can get 8 popcorns, if you plug in 0 for popcorn, she can buy 20 sodas)

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3 years ago

If 2 dozens of eggs cost #300. How much will 5 eggs cost?

LenKa [72]

answer:62.5

a dozen=12 eggs

12× 2 eggs=300

5 eggs=x

cross multiply

24x=1500

thus x=62.5

5 0

3 years ago

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There were 820 orange buttons in a container. The number of orange buttons was 160 fewer than the number of yellow buttons and 2

denis-greek [22]

Answer: There are 3615 buttons

Step-by-step explanation:

From this situation we can write a system of equations if we tag the orange buttons with $o$ , the yellow buttons with $y$ , the green buttons with $g$ and the blue buttons with $b$ :

There were 820 orange buttons:

$o=820$ (1) Number of orange buttons

The number of orange buttons was 160 fewer than the number of yellow buttons:

$o=y-160$ (2)

The number of orange buttons was 210 more than the number of green buttons:

$o=g+210$ (3)

1/3 of the total number of buttons in the container were blue buttons:

If the total is the sum of the buttons of each color, we have:

$\frac{1}{3}(o+y+g+b)=b$ (4)

At this point we have our system with 4 equations and 4 unknowns.

Let's begin by substituting (1) in (2):

$820=y-160$ (5)

Isolating $y$ :

$y=980$ (6) Number of yellow buttons

Subsituting (1) in (3):

$820=g+210$ (7)

Isolating $g$ :

$g=610$ (8) Number of green buttons

Substituting (1), (6) and (8) in (4):

$\frac{1}{3}(820+980+610+b)=b$ (9)

Isolating $b$ :

$b=1205$ (10) Number of blue buttons

Now we can find the total number of buttons:

$o+y+g+b=820+980+610+1205=3615$ (11) This is the total number of buttons

4 0

3 years ago

For a sample of eight bears, researchers measured the distances around the bears' chests and weighed the bears. Minitab was us

Yakvenalex [24]

Answer:

There is a linear correlation between the chest size and weight

Proportion of the variation in weight can be explained by the linear relationship between weight and chest size is 0.006724 .

Step-by-step explanation:

Null Hypothesis: $H_0$ = There is no linear correlation between the chest size and weight

Alternative Hypothesis : $H_a$ =There is a linear correlation between the chest size and weight

The value of the linear correlation coefficient is r=0.882.

n = 8

Formula : $t=\frac{r\sqrt{n-2}}{\sqrt{1-r^2}}$

$t=\frac{0.882\sqrt{8-2}}{\sqrt{1-(0.882)^2}}$

$t=4.584$

Degree of freedom = n-1 = 8-1 = 7

α =0.05

so, p value is 2.365

t calculated > t critical

So, we reject the null hypothesis

So, There is a linear correlation between the chest size and weight

The proportion of the variation in weight can be explained by the linear relationship between weight and chest size = $r^2 = (0.082)^2=0.006724$

Hence proportion of the variation in weight can be explained by the linear relationship between weight and chest size is 0.006724 and There is a linear correlation between the chest size and weight

4 0

3 years ago