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sergeinik [125]
3 years ago
9

Need help please thxs​

Mathematics
1 answer:
vekshin13 years ago
7 0
Its option C

40 × (¹/₄)⁰ = 40

40 × (¹/₄)¹ = 10

40 × (¹/₄)² = 5/2

40 × (¹/₄)³ = 5/8

40 × (¹/₄)⁴ = 5/32
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What is the solution to бn + 1 = 2n – 7
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Answer:

n = -2

Step-by-step explanation:

6n = 2n-8

4n = -8

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12/11k÷4/3k<br><br>simplify the fraction
Nonamiya [84]

Answer:

9/11

Step-by-step explanation:

12/11k÷4/3k

Copy dot flip

12/11k* 3k/4

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Divide the top and bottom by 4k

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Find the quotient. 64,705 divided by 386
goldfiish [28.3K]

Answer:

167 243/386

Step-by-step explanation:

For steps, use this link:

https://mathsolver.microsoft.com/en/solve-problem/64705%20%60div%20%20386

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3 years ago
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Dwayne drove 18 miles to the airport to pick up his father and then returned home. On the return trip he was able to drive an av
Nesterboy [21]

Answer:

30 mph

Step-by-step explanation:

Let d = distance (in miles)

Let t = time (in hours)

Let v = average speed driving <u>to</u> the airport (in mph)

⇒ v + 15 = average speed driving <u>from</u> the airport (in mph)

Using:  distance = speed x time

\implies t=\dfrac{d}{v}

Create two equations for the journey to and from the airport, given that the distance one way is 18 miles:

\implies t=\dfrac{18}{v}  \ \ \textsf{and} \ \  t=\dfrac{18}{v+15}

We are told that the total driving time is 1 hour, so the sum of these expressions equals 1 hour:

\implies \dfrac{18}{v} +\dfrac{18}{v+15}=1

Now all we have to do is solve the equation for v:

\implies \dfrac{18(v+15)}{v(v+15)} +\dfrac{18v}{v(v+15)}=1

\implies \dfrac{18(v+15)+18v}{v(v+15)}=1

\implies 18(v+15)+18v=v(v+15)

\implies 18v+270+18v=v^2+15v

\implies v^2-21v-270=0

\implies (v-30)(v+9)=0

\implies v=30, v=-9

As v is positive, v = 30 only

So the average speed driving to the airport was 30 mph

(and the average speed driving from the airport was 45 mph)

8 0
2 years ago
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Ninas dog eats 1/6 lb of dog food twice a day. If Nina buys a 20 lb bag of dog food, how many days will the bag feed her dog?
My name is Ann [436]

Answer:

<h2>60 days</h2>

Step-by-step explanation:

<h3>Step 1: First, since it is 1/6 pound twice a day, multiply by 2</h3>

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<h3>Step 2: Divide 20 by 3 to get days that bag will feed the dog</h3>

20 ÷ 1/3 = 60

The bag will feed Nina's dog for 60 days.

I'm always happy to help :)

7 0
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