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Vikentia [17]
3 years ago
12

I NEED THIS NOW PLS HELP Stella walks down a flight of stairs to the basement. Then she walks back up the stairs and up another

flight of stairs to the second floor of her house. Each flight of stairs represents a change of 12 feet in height. How far is Stella above the ground
Mathematics
1 answer:
ahrayia [7]3 years ago
7 0

Answer:

She is 12 feet abouv ground.

Step-by-step explanation:

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The altitude of a triangle is increasing at a rate of 1 cm/ min while the area of the triangle is increasing at a rate of 2 cm2
serg [7]
Ya, calculus and related rates, such fun!




everything is changing with respect to t

altitude rate will be dh/dt and that is 1cm/min
dh/dt=1cm/min

area will be da/dt which is increasing at 2cm²/min
da/dt=2cm²/min

base=db/dt

alright

area=1/2bh
take dervitivie of both sides
da/dt=1/2((db/dt)(h)+(dh/dt)(b))
solve for db/dt
distribute
da/dt=1/2(db/dt)(h)+1/2(dh/dt)(b)
move
da/dt-1/2(dh/dt)(b)=1/2(db/dt)(h)
times 2 both sides
2da/dt-(dh/dt)(b)=(db/dt)(h)
divide by h
(2da/dt-(dh/dt)(b))/h=db/dt

ok
we know
height=10
area=100
so
a=1/2bh
100=1/2b10
100=5b
20=b

so
h=10
b=20
da/dt=2cm²/min
dh/dt=1cm/min

therefor
(2(2cm²/min)-(1cm/min)(20cm))/10cm=db/dt
(4cm²/min-20cm²/min)/10cm=db/dt
(-16cm²/min)/10cm=db/dt
-1.6cm/min=db/dt

the base is decreasing at 1.6cm/min
4 0
3 years ago
Baby Audrey weighed 6 pounds 12 ounces at birth. Convert her weight to ounces
wlad13 [49]

Answer:

108 is the answer I think

6 0
3 years ago
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if one person walked 1.2miles and the other walked 0.8 miles and they made 120.00 how much money did each one make
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The one who walked 1.2 miles would have made $72 and the one who walked 0.8 miles would have made $48.
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Jlenok [28]

Answer:

Ato find the vertex

Step-by-step explanation:

6 0
3 years ago
A store uses the expression –2p + 50 to model the number of backpacks it sells per day, where the price, p, can be anywhere from
Grace [21]

Your question is  store uses the expression –2p + 50 to model the number of backpacks it sells per day, where the price, p, can be anywhere from $9 to $15. Which price gives the store the maximum amount of revenue, and what is the maximum revenue?

The answer is C. $12.50 per backpack gives the maximum revenue; the maximum revenue is $312.50.

7 0
3 years ago
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