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3 years ago

Roesha spent $8.50 every hour for 2.5. Write and simplify and expression and to determine the total amount of money she spent

Mathematics

2 answers:

Mkey [24]3 years ago

8 0

Answer:

(-8.50)×2.5= -21.25

Step-by-step explanation:

Juli2301 [7.4K]3 years ago

6 0

8.50 +8.50= 17.00

1/2 of 8.50 is 4.25

so 17.00+4.25= 21.25

Roesha spent $21.25

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3 years ago

How to solve this equation

Artyom0805 [142]

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Answer:

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Step-by-step explanation:

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2 years ago

Read 2 more answers

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DENIUS [597]

Answer:

$\frac{d}{dx}(-xcos3x)= 3x \ sin(3x)- cos(3x)$

Step-by-step explanation:

Use the Product Rule for derivatives, which states that:

$\frac{d}{dx} =[f(x)g(x)]= f(x)g'(x)+f'(x)g(x)$

In the function we are given, $f(x)=-x \cos3x$ , we can break it up into two factors: -x is being multiplied by cos3x.

Now, we have the factors:

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Before using the product rule, let's find the derivative of cos3x using the chain rule and the power rule.

$\frac{d}{dx}(cos3x)= \frac{d}{dx} (cos3x) \times \frac{d}{dx} (3x) \\ \frac{d}{dx}(cos3x)= (-sin3x) \times 3 \\ \frac{d}{dx} (cos3x) = -3sin(3x)$

Now let's apply the product rule to f(x) = -xcos3x.

$\frac{d}{dx}(-xcos3x)= (-x)(-3sin3x) + (-1)(cos3x)$

Simplify this equation.

$\frac{d}{dx}(-xcos3x)= (x)(3sin3x) - (cos3x)$

Multiply x and 3 together and remove the parentheses.

$\frac{d}{dx}(-xcos3x)= 3x \ sin(3x)- cos(3x)$

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3 years ago

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Leona [35]

Answer:

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Step-by-step explanation:

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