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2 years ago

Help me ASAP!!!!!!!!!!!

Mathematics

2 answers:

STALIN [3.7K]2 years ago

7 0

Answer:

x = -2,2

Step-by-step explanation:

I kept an attachment for the solution

oksian1 [2.3K]2 years ago

5 0

Answer:

I'm not sure but I think it's the 3rd one

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If y = 3x^3 - 2x and dx/dt equals 3, find dy/dt when x = -2. Give only the numerical answer. For example, if dy, dt = 4, type on

Nadya [2.5K]

Answer:

$\frac{dy}{dt} = 102$

Step-by-step explanation:

step(i)

Given function y = 3 x³ - 2 x ... (i)

Differentiating equation (i) with respective to 'x'

$\frac{dy}{dx} = 3 (3 x^{2} ) - 2(1)$

Given x = -2

$(\frac{dy}{dx} ) x_{=-2} = 3 (3 (-2)^{2} ) - 2(1)$

$(\frac{dy}{dx} ) x_{=-2} = 36 -2 =34$

Step(ii):-

we know that

$\frac{dy}{dx} = \frac{\frac{dy}{dt} }{\frac{dx}{dt} }$

Given $\frac{dx}{dt} = 3 and \frac{dy}{dx} = 34$

$\frac{dy}{dx} = \frac{\frac{dy}{dt} }{\frac{dx}{dt} }$

substitute values $\frac{dx}{dt} = 3 and \frac{dy}{dx} = 34$

⇒ $34 = \frac{\frac{dy}{dt} }{3 }$

cross multiplication , we get

$\frac{dy}{dt} = 34( 3 ) = 102$

Final answer:-

$\frac{dy}{dt} = 34( 3 ) = 102$

8 0

2 years ago

Antonio orders an iPhone case off of Amazon for $27. He has to pay an additional 3% for shipping and handling. How much will his

Wewaii [24]

Answer:

We conclude that total cost/bill will be: $27.81

Step-by-step explanation:

Given

The cost of an iPhone case = $27

Additional expense = 3% = 3/100 = 0.03

To determine

Total bill = ?

The expense amount can be calculated by multiplying the cost of an iPhone case by the additional expense

i.e.

Expense Amount = cost of an iPhone case × additional expense

= 27 × 0.03

= $0.81

The total cost is calculated by adding the expense amount and the original cost of an iPhone case.

i.e.

Total cost/bill = Expense Amount + cost of an iPhone case

= $0.81 + $27

= $27.81

Therefore, we conclude that total cost/bill will be: $27.81

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2 years ago

Dawn Lingua bought three yards of cloth to make some curtains . The cloth was on sale for $2.25 per yard. How much did Dawn pay

swat32

2.25 x 3 = 6.75 ,6.75 x .05 = 0.34 ,6.75 + 0.34 = 7.09 ,Answer is $7.09

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2 years ago

Hi, in need of a little assistance.Question: calculate the internal area of the living room.

Dominik [7]

The living room is rectangular. We would find the area by applying the formula for calculating the area of a rectangle which is expressed as

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internal length = 5.2

internal width = 2.95

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