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2 years ago

HELP PLEASE FAST NOW

Mathematics

1 answer:

tresset_1 [31]2 years ago

3 0

Answer:

422

Step-by-step explanation:

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Alejandro rode his bike to work at an average rate of 15 miles per hour. To go home, he put his bike on the front rack of the bu

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The answer is C, 0.5 hours.

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Write and solve an equation to find the number n

SCORPION-xisa [38]

Answer:

4(n-7)=12

Step-by-step explanation:

4(n-7)=12

4n-28=12

4n=40

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4 years ago

A tank holds 300 gallons of water and 100 pounds of salt. A saline solution with concentration 1 lb salt/gal is added at a rate

Shkiper50 [21]

The amount of salt in the tank changes with rate according to

$Q'(t)=\left(1\dfrac{\rm lb}{\rm gal}\right)\left(4\dfrac{\rm gal}{\rm min}\right)-\left(\dfrac{Q(t)}{300+(4-1)t}\dfrac{\rm lb}{\rm gal}\right)\left(1\dfrac{\rm gal}{\rm min}\right)$

$\implies Q'+\dfrac Q{300+3t}=4$

which is a linear ODE in $Q(t)$ . Multiplying both sides by $(300+3t)^{1/3}$ gives

$(300+3t)^{1/3}Q'+(300+3t)^{-2/3}Q=4(300+3t)^{1/3}$

so that the left side condenses into the derivative of a product,

$\big((300+3t)^{1/3}Q\big)'=4(300+3t)^{1/3}$

Integrate both sides and solve for $Q(t)$ to get

$(300+3t)^{1/3}Q=(300+3t)^{4/3}+C$

$\implies Q(t)=300+3t+C(300+3t)^{-1/3}$

Given that $Q(0)=100$ , we find

$100=300+C\cdot300^{-1/3}\implies C=-200\cdot300^{1/3}$

and we get the particular solution

$Q(t)=300+3t-200\cdot300^{1/3}(300+3t)^{-1/3}$

$\boxed{Q(t)=300+3t-2\cdot100^{4/3}(100+t)^{-1/3}}$

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3 years ago

the probability that your ticket will be chosen in a drawing is 6%. there are 250 tickets in the drawing. how many tickets are y

Len [333]

You need to find 6% of 250. To do that, change 6% to a decimal (0.06) and multiply that by 250. That answer is how many tickets you have.

6%=0.06

250
x0.06
______
15.00. move the decimal point in 2 spaces

15
Final Answer: 15 tickets are yours.

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