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Anika [276]
3 years ago
15

Using the following triangle, what is the cosine of angle B?

Mathematics
1 answer:
stealth61 [152]3 years ago
3 0

Hello!

To find cosine, use the formula cos = adjacent / hypotenuse.

According to angle B, adjacent of angle B is side A, and the hypotenuse is side c because the hypotenuse is always opposite the right angle.

Therefore, the cosine of angle B is a/c.

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What is the reciprocal of 2/7​
sineoko [7]

Answer:

the reciprocal of 2/7 is 7/2. you just switch the numbers

4 0
2 years ago
A motorcyclist leaves City A and rides at a constant speed towards City B, which is 225 km away. After 1.5 hours, the motorcycli
rewona [7]

Answer:

50 km/hr

Step-by-step explanation:

OK, this is how I solved this problem.

Let r = original rate of speed

     t = time after the stop to finish the trip

Time for trip without stopping is 225/r

(1)     1.5 + .5 + t = 225/r      This is a time equation

(2)    1.5r + t(r + 10) = 225     This is a distance equation

(1)       2 + t = 225/r            (2)      1.5r + tr + 10t = 225

         2r + tr = 225

                tr = 225 - 2r                 1.5r + 225 - 2r + 10(225/r - 2) = 225

                t = 225/r - 2

                                                   -.5r + 225 + 2250/r - 20 = 225

                                                     -5r + 2250 + 22500/r - 200 = 2250

                                                     -5r^2 + 2250r + 22500 - 200r = 2250r

                                                       5r^2 + 200r - 22500 = 0

                                                       5(r^ + 40r - 4500) = 0

                                                           5(r - 50)(r + 90) = 0

                                                                 r = 50   or    r = -90

The rate cannot be negative, so the original speed 50 km/hr

This not an easy problem and I hope you were able to follow my work

5 0
3 years ago
Read 2 more answers
What is true about a function?
mars1129 [50]

Answer: Your answer is the third one, a function assigns to each input exactly one output.

If you have a true function, there will only be one output for each input, if you had more than one, it isn't a function.


6 0
3 years ago
Read 2 more answers
I need help asap please? this is for math? what is the square root of 144+12^2-72x6/3?
kirill115 [55]

Answer:

the answer is 312 hopes this helps

Step-by-step explanation:

the square root of 144 is 12

12+12^2 =?

12+144=156

156x6=936

936/3=?

312

4 0
2 years ago
Read 2 more answers
Six items purchased at a grocery store weigh 11 kilograms one of the items is detergent weighing 556 grams what is the total wei
slavikrds [6]

556 \: g \times  \frac{1 \: kg}{1000g} = 0.556 \: kg

11 \: kg - 0.556 \: kg = 10.444 \: kg

The total weight of the other five items are 10.444 kg

<em>(round as you wish)</em>

7 0
3 years ago
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