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2 years ago

Help quick please

Mathematics

1 answer:

GaryK [48]2 years ago

3 0

Answer:

Growth

Step-by-step explanation:

since the (1.05) is bigger than 1 it is growth but if it was lower then 1 it would be decay .

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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)

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1 year ago

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Cameron estimates that the math class will sell 200 calendars. what will the total cost be'

Airida [17]

Well i can't really help you in this since i do not know the cost of each calendar, but if you need the formula.

the cost of one calendar = x

so the total cost would be 200 times x (200x)

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3 years ago

a house has decreased in value by 33% since it was purchased. If the current value is $268,000, what was the value when it was p

Dafna1 [17]

Answer:

around 179,560

Step-by-step explanation:

you do the total times .33 and then with that number subtract 268,000 which should give you 179,560

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2 years ago

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Which answer choice correctly uses grouping symbols to make an expression equivalent to 312

Andrew [12]

The answer is 3×(4+3^2)×8

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2 years ago

An observation deck extends 311 feet out above a valley. The deck sits 261 feet above the valley floor. If an object is dropped

Andreas93 [3]

Answer:

4.12

Step-by-step explanation:

its 4.12 mark me brainiless

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2 years ago

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