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bulgar [2K]
3 years ago
7

suppose two rectangles are similar with a scale factor of 2. what is the ratio of their areas? explane

Mathematics
1 answer:
Papessa [141]3 years ago
6 0
Ratio of areas is always cubed. Lengths are always squared
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Evaluate the dot product of (7, 5) and (- 5, 4)
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Answer:

The dot product of (7,5) and (-5,4) is -15

Step-by-step explanation:

Given

(7,5) and (-5,4)

Required

Determine the dot product

Dot product is calculated using the following formula;

a.b = {a_1b_1+a_2b_2+...+a_nb_n}

Let a = (7,5) and b = (-5,4);

The above formula becomes

a.b = {7*-5+5*4}

a.b = {-35+20}

a.b = {-15}

Hence, the dot product of (7,5) and (-5,4) is -15

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