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san4es73 [151]
3 years ago
6

Please please help me with this. Matrices is so difficult.

Mathematics
1 answer:
galina1969 [7]3 years ago
7 0

Answer:

Choice D.

Step-by-step explanation:

D=[18. 16]

[-14 -6]

-0.5D = [-0.5(18) -0.5(16)]

[-0.5(-14) -0.5(-6)]

-0.5D = [ -9 -8]

[ 7 3]

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3 years ago
a rope is cut into 3 pieces p,q and r. the lengths of the pieces are in the ratio 3:5:7. if the rope is 33 feet 9 inches long, f
Marta_Voda [28]

If the pieces are cut in the ratio <span>3:5:7</span>, the proportion of each piece to the whole (represented by <span>3+5+7=15</span>) is:

<span><span>3/15</span>:<span>5/15</span>:<span>7/15</span></span>

First, convert the inches to feet also:

1 foot equals to 12 inches.

So 9 inches <span>=<span>9/12</span>×1=0.75</span> feet.

Thus, 33 feet and 9 inches equal <span>33+0.75=33.75</span> feet.

So,

<span>P=<span>3/15</span>×33.75=6.75</span> feet.

<span>Q=<span>5/15</span>×33.75=11.25</span> feet.

<span>R=<span>7/15</span>×33.75=15.75</span> feet.

You can check that these answers are correct by adding up the different pieces: <span>6.75+11.25+15.75=<span>33.75</span></span>

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