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3 years ago

Sassy jeans are $90 a pair. If they are 40% off today, how much will they cost?

Mathematics

2 answers:

Lapatulllka [165]3 years ago

8 0

The answer is 36. You have to do 40 multiply by 90 then divide by 100 then you will get 36.

Slav-nsk [51]3 years ago

7 0

They will cost $54
i know this because if youre getting 40% off, you will have to pay 60% of the total cost
so, 90 x .60 = 54
let me know if you have any further questions
:)

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Answer:

Step-by-step explanation:

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3 years ago

A plane flying horizontally at an altitude of 1 mi and a speed of 470 mi/h passes directly over a radar station. Find the rate a

kiruha [24]

Answer:

407 mi/h

Step-by-step explanation:

Given:

Speed of plane (s) = 470 mi/h

Height of plane above radar station (h) = 1 mi

Let the distance of plane from station be 'D' at any time 't' and let 'x' be the horizontal distance traveled in time 't' by the plane.

Consider a right angled triangle representing the above scenario.

We can see that, the height 'h' remains fixed as the plane is flying horizontally.

Speed of the plane is nothing but the rate of change of horizontal distance of plane. So, $s=\frac{dx}{dt}=470\ mi/h$

Now, applying Pythagoras theorem to the triangle, we have:

$D^2=h^2+x^2\\\\D^2=1+x^2$

Differentiating with respect to time 't', we get:

$2D\frac{dD}{dt}=0+2x\frac{dx}{dt}\\\\\frac{dD}{dt}=\frac{x}{D}(s)$

Now, when the plane is 2 miles away from radar station, then D = 2 mi

Also, the horizontal distance traveled can be calculated using the value of 'D' in equation (1). This gives,

$2^2=1+x^2\\\\x^2=4-1\\\\x=\sqrt3=1.732\ mi$

Now, plug in all the given values and solve for $\frac{dD}{dt}$ . This gives,

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3 years ago

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Maksim231197 [3]

Answer:

Step-by-step explanation:

We are given that a decimal number d

d=0.12345678...

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Place of first digit 1 after decimal=Tenth

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Place of third digit 3 after decimal=Thousandth

Therefore, 100th digit of d to the right of the decimal point=2

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