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Anna [14]
2 years ago
14

PLS HELP I WILL GIVE BRAINLIEST 1- If you are driving at a constant speed of 55 miles per hour, give an estimate of how many mil

es you will travel in 1 hour and 20 minutes.
2-Anthony paid $36.25 for about 11.5 gallons of gas. Estimate the price for one gallon of gas.

Write an expression that represents each statement.
3.The total cost of my cell phone bill for the 1st month, if I am charged a standard installation fee of $50 plus .50 cents for each channel that I have in my package.
Mathematics
1 answer:
Hatshy [7]2 years ago
8 0

Answer:

1- 72 miles

2-$3

3- 50(0.50 x c)

Step-by-step explanation:

For Number 1 we have to do 55 divided by 60 which is about 0.90 and then we multiply that by 1 hour and 20 minutes which in minutes is 80. 0.90 x 80 = 72 exactly.

For Number 2 we have to divide 36.25 by 11.5 rounded is 36/12 whish is 3.

For number 3 c stands for number of channels

Hope i could help! :DD

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Use differentials to estimate the amount of metal in a closed cylindrical can that is 26 cm high and 10 cm in diameter if the me
Afina-wow [57]

Answer:

The estimated amount of metal in the can is 87.96 cubic cm

Step-by-step explanation:

We can find the differential of volume from the volume of a cylinder equation given by

V= \pi r^2 h

Thus that way we will find the amount of metal that makes up the can.

Finding the differential.

A small change in volume is given by:

dV =\cfrac{\partial V}{\partial h} dh + \cfrac{\partial V}{\partial r} dr

So finding the partial derivatives we get

dV =\pi r^2 dh + \pi 2r h dr

dV =\pi r^2 dh + 2\pi r h dr

Evaluating the differential at the given information.

The height of the can is h = 26 cm, the diameter is 10 cm, which means the radius is half of it, that is r = 5 cm.

On the other hand the thickness of the side is 0.05 cm that represents dr = 0.05 cm, and the thickness on both top and bottom is 0.3 cm, thus dh = 0.3 cm +0.3 cm which give us 0.6 cm.

Replacing all those values on the differential we get

dV =\pi 5^2 (0.6) + 2\pi (5) (26) (0.05)

That give us

V= 28 \pi  \, cm^3

Or in decimal value

\boxed{dV= 87.96 \, cm^3}

Thus the volume of metal in the can is 87.96 cubic cm.

6 0
3 years ago
Is 43 a composite number
d1i1m1o1n [39]
No.  43 is a prime number.  It has no other factors besides ' 1 ' and itself.
7 0
2 years ago
Read 2 more answers
Factor x2 + 10x – 18. prime (x + 3)(x – 6) (x – 2)(x – 9) (x – 2)(x + 5)
Marta_Voda [28]

Answer:

prime

Step-by-step explanation:

x^2 + 10x – 18

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This cannot be factored

8 0
3 years ago
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jeka57 [31]

Answer:

0.367

Step-by-step explanation:

i took the test and this is what i got    x = 11/30 = 0.367

hope this helps you

6 0
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f^{-1}(81) is asking for what number x will the function f(x)=3x will produce 81.

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