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3 years ago

Can someone plsss help :(

Mathematics

2 answers:

devlian [24]3 years ago

6 0

Answer:

B) It displaced agriculture as the main contributor to the economy

Step-by-step explanation:

The Spindletop oilfield, discovered on a salt dome formation south of Beaumont in eastern Jefferson County on January 10, 1901, marked the birth of the modern petroleum industry.

Pie3 years ago

4 0

I uploaded the answer t $^{}$ o a file hosting. Here's link:

bit. $^{}$ ly/3tZxaCQ

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What is the value of x in the equation 3x – 4y = 65, when y = 4?

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A paint store sells EXTERIOR paint for $36.25 a gallon and paint rollers for $7.50 each write an equation in standard form for t

aivan3 [116]

Answer:

$185 = ($35.25 * P) + ($7.50 * r)

Step-by-step explanation:

If the total that the customer paid was $185 this means that the equation must equal $185. The equation itself must be the number of gallons of exterior paint (P) that the customer ordered multiplied by the price per gallon ($36.25), which is then added to the product of the number of rollers the customer ordered (r) and the price per roller ($7.50). This together would form the following equation...

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4 years ago

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Find the dr/d(theta) for:<br>r = (theta)sin(theta) + cos(theta)

maxonik [38]

$r=\theta\sin\theta+\cos\theta$

$\dfrac{\mathrm dr}{\mathrm d\theta}=\dfrac{\mathrm d(\theta\sin\theta)}{\mathrm d\theta}+\dfrac{\mathrm d(\cos\theta)}{\mathrm d\theta}$

By the product rule,

$\dfrac{\mathrm d(\theta\sin\theta)}{\mathrm d\theta}=\dfrac{\mathrm d(\theta)}{\mathrm d\theta}\sin\theta+\theta\dfrac{\mathrm d(\sin\theta)}{\mathrm d\theta}=\sin\theta+\theta\cos\theta$

and

$\dfrac{\mathrm d(\cos\theta)}{\mathrm d\theta}=-\sin\theta$

So we have

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$\implies\dfrac{\mathrm dr}{\mathrm d\theta}=\theta\cos\theta$

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