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guapka [62]
3 years ago
15

Maria wants to add to her CD collection. If a CD costs $12, which expression shows the cost of d CDs? A. 12 - d B. 12 ÷ d C. 12

+ d D. 12 × d
Mathematics
2 answers:
aleksklad [387]3 years ago
7 0

Step-by-step explanation:

Cost of CDs

= Number of CDs * Cost of one CD

= d * $12

= $12d. (D)

The answer is using multiplication as we have a unit rate and we wish to find the total.

kipiarov [429]3 years ago
7 0

Answer:

D. 12*d, or 12d

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3 years ago
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Solve please. 20 points.
Yakvenalex [24]

Answer:

336 cm^2

Step-by-step explanation:

Well theres not exactly a formula, I jsut solve the 3 faces and then double it all since 2 are the same for each except for 1 so the first side is the 10X12 one. that would give you 60 and then you double that and get 120 since 2 same faces.

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3 years ago
Determine the projection of w onto u
natali 33 [55]

Answer:

c. 6.2i - 4.2j

Step-by-step explanation:

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Where the dot product of two vectors is given by:

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And the magnitude of a vector is given by:

||u||=\sqrt{u_1^2+u_2^2+...+u_n^2}

Using the previous definition, let's calculate the projection of w onto u:

First let's calculate the dot product between w and u:

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Now let's find the magnitude of u:

||u||=\sqrt{9^2+(-6)^2} = 3 \sqrt{13}

So:

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Therefore:

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GuDViN [60]

Answer:

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Step-by-step explanation:

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