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3 years ago

Pls explain this to me!!

Mathematics

1 answer:

andre [41]3 years ago

7 0

A) C(7) represents the cost of an Uber for 7 miles. Since 'm' is the cost for m miles, '7' is the cost for 7 miles.

B) If Todd's total bill was $30, that means the cost (C) is 30. Replace C with 30.

30 = 1.5m+4.5

Now solve this equation.

30-4.5 = 1.5m+4.5-4.5

25.5 = 1.5m

m = 17

If Todd's total bill was $30, his Uber ride was 17 miles.

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3 years ago

A tank contains 1000 L of pure water. Brine that contains 0.05 kg of salt per liter of water enters the tank at a rate of 5 L/mi

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Answer:

a) $y(t)=0.65\frac{Kg}{min}(tmin)$

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Step-by-step explanation:

Data

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$V_{Ba}=5\frac{Lt}{min}\\ Concentration(Bca)=0.05\frac{Kg}{Lt}$

Brine b (Bb)

$V_{Bb}=10\frac{Lt}{min}\\ Concentration(Bcb)=0.04\frac{Kg}{Lt}$

we have that per every minute the amount of solution that enters the tank is the same as the one that leaves the tank (15 Lt / min)

, then the amount of salt (y) left in the tank after (t) minutes: $y=V_{Ba}*B_{ca}+V_{Bb}*B_{cb}=5\frac{Lt}{min}*0.05\frac{Kg}{Lt}+10\frac{Lt}{min}*0.04\frac{Kg}{Lt}=\\0.25\frac{Kg}{min}+0.4\frac{Kg}{min}=0.65\frac{Kg}{min}$

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being y(t) the amount of salt (y) per unit of time (t)

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2 years ago

When dividing 250,000 by 100, the digits in the quotient move how many places to the right?

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When dividing 250,000 by 100, the digits in the quotient move by 2 places to the right.

<u>Step-by-Step explanation:</u>

Here we have , to find out that When dividing 250,000 by 100, the digits in the quotient move how many places to the right . Let's find out:

⇒ dividing 250,000 by 100

⇒ 250,000 / 100

⇒ $\frac{250000}{100}$

⇒ $\frac{2500(100)}{100}$

⇒ $2500$

Initially we had 250,000 of 6 digits and now after dividing 250,000 by 100, we have 2500 of 4 digits ! So , Number of places quotient shift to right is:

⇒ $6-4$

⇒ $2$

Therefore, When dividing 250,000 by 100, the digits in the quotient move by 2 places to the right.

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2 years ago