4 years ago

Mark practices his guitar 3/4 hours each day. How many hours does he practice in seven days?

Mathematics

1 answer:

Mashutka [201]4 years ago

6 0

3/4 *7
or
0.75*7
The answer is 5.25

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Answer is C. 1/169
first we find how many cards are jacks in a deck: 4 out of 52 cards.
4/52 = 1/13 ( We have a 1 in 13 chance of drawing a jack)
(1/13)(1/13) = 1/169
( because the first card is replaced, we know that we don't have to change probabilities)(it will still be a 4/52 chance of drawing a jack)

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3 years ago

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The bearings of ships A and B from a port P are 225° and 116° respectively. Ship A is 3.9km from ship B on a bearing of 258°.

Kobotan [32]

Answer:

2.54 km

Step-by-step explanation:

<em>See the attached</em>

All given details are reflected in the diagram (not to scale)

PA is at 225°, PB is at 116°, BA is at 258°
AB = 3.9 km
AP = x

m∠P = 225° - 116° = 109°
m∠A = 258° - 225° = 33°
m∠B = 180° - (109° + 33°) = 38°

<u>Use the law of sines:</u>

x/ sin 38° = 3.9 / sin 109°
x = 3.9 sin 38° / sin 109°
x = 2.54 km (rounded)

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Answer:

Step-by-step explanation:

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