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3 years ago

What's one talent y'all have ?

Mathematics

1 answer:

kvasek [131]3 years ago

7 0

Answer:

I was born with crazy back flexibility and I can put my feet over my head while my back is flat against my butt :)

Step-by-step explanation:

that probobly sounds a little creepy lol

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A chemist mixes a 10% hydrogen peroxide solution with a 25% hydrogen peroxide solution to create 30 liters of a 15% hydrogen per

iris [78.8K]

Let x represent the amount of 10% solution used.
Let y represent the amount of 25% solution used.

Since 30 liters of 15% solution are being made, our first equation is
x + y = 30

Now we deal with the actual peroxide in each solution.
x liters of 10% peroxide contain 0.1x liters of peroxide.
y liters of 25% peroxide contain 0.25y liters of peroxide.
30 liters of 15% peroxide contain 0.15 * 30 = 4.5 liters of peroxide.
From this information, we can write our second equation.

0.1x + 0.25y = 4.5

We have a system of equations:

x + y = 30
0.1x + 0.25y = 4.5

Multiply the first equation by -0.25 and add to the second equation.

-0.25x - 0.25y = -7.5
0.1x + 0.25y = 4.5
---------------------------
-0.15x = -3

x = 20

Answer: 20 liters

5 0

4 years ago

Read 2 more answers

What is the value of y? Enter your answer as an exact value in the box

VLD [36.1K]

Answer:

y = 3

hope it helps and your day will be full of happiness

4 0

3 years ago

Oceanside Bike Rental shop charges a 14 dollar fixed fee plus 9 dollars an hour for renting a bike.Sara paid 77 dollars to rent

labwork [276]

Answer:

7 hours

Step-by-step explanation:

We have that the value of the review of a bicycle has the following function:

v = 14 + 9 * t

where t is the time in hours

if we know that Aara paid a total of 77, that is v = 77, we can calculate the value of t, replacing:

77 = 14 + 9 * t

solving for t:

t = (77 - 14) / 9

t = 7

that is to say that Sara left the bicycle in a total of 7 hours

5 0

3 years ago

What is the probability that she picks a red marble then a green then a blue or orange if there are 75 blue 50 green 100 orange

denpristay [2]

Answer:

7/500

Step-by-step explanation:

1/10*1/5*7/10

6 0

4 years ago

The equation h(t) = -16t² + 80t + 64 represented the height, in feet, of a potato t seconds after it has been launched.

Lyrx [107]

Answer:

Part A) The potato hit the ground at t=5.70 seconds (see the explanation)

Part B) The potato is 40 feet off the ground at the time t=5.28 seconds (see the explanation)

Step-by-step explanation:

we have

$h(t)=-16t^2+80t+64$

where

h(t) is the height of a potato in feet

t is the time in seconds

Part A) Write an equation that can be solved to find when the potato hits the ground. Then solve the equation

we know that

When the potato hit the ground, the value of h(t) must be equal to zero

For h(t)=0

$-16t^2+80t+64=0$

Solve the quadratic equation

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$-16t^2+80t+64=0$

$a=-16\\b=80\\c=64$

substitute in the formula

$t=\frac{-80\pm\sqrt{80^{2}-4(-16)(64)}} {2(-16)}$

$t=\frac{-80\pm\sqrt{10,496}} {-32}$

$t=\frac{-80+\sqrt{10,496}} {-32}=-0.70$

$t=\frac{-80-\sqrt{10,496}} {-32}=5.70$

therefore

The potato hit the ground at t=5.70 seconds

Part B) Write an equation that can be solved to find when the potato is 40 feet off the ground. Then solve the equation

For h(t)=40 ft

substitute in the quadratic equation

$-16t^2+80t+64=40$

$-16t^2+80t+24=0$

Solve the quadratic equation

we have

$a=-16\\b=80\\c=24$

substitute in the formula

$t=\frac{-80\pm\sqrt{80^{2}-4(-16)(24)}} {2(-16)}$

$t=\frac{-80\pm\sqrt{7,936}} {-32}$

$t=\frac{-80+\sqrt{7,936}} {-32}=-0.28$

$t=\frac{-80-\sqrt{7,936}} {-32}=5.28$

therefore

The potato is 40 feet off the ground at the time t=5.28 seconds

3 0

3 years ago