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riadik2000 [5.3K]
3 years ago
14

EASY POINTS PLZ HELP

Mathematics
1 answer:
Grace [21]3 years ago
4 0

Answer:

The age of the person who walked in the room is 44.

Step-by-step explanation:

The original mean age is 38 which means the total ages combined divided by the 5 people.

5 people x 38 (the mean age) = x

x = Total ages combined

x = 190 years old

Then another person came in, now totaling 6 people, and the mean age changed to 39 years old, an increase.

6 people x 39 (the new mean age) = y

y = Total ages combined

y = 234 years old

So, we are trying to figure out the age of the new person who came in. We have to subtract the new total age (y) by the original total age (x).

y - x = Age of new person in room

234 years old - 190 years old =

44 years old

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In triangleABC, angle B= 90 degrees, cos(C)=15/17 and AB = 16 what is the measure of Angle A, Angle C and angle AC
Sergeeva-Olga [200]

Answer:

m∠C=28°, m∠A=62°, AC=34.1 units

Step-by-step explanation:

Given In ΔABC, m∠B = 90°, , and AB = 16 units. we have to find m∠A, m∠C, and AC.

As,  cos(C)={15}/{17}

⇒ angle C=cos^{-1}(\frac{15}{17})=28.07^{\circ}\sim28^{\circ}

By angle sum property of triangle,

m∠A+m∠B+m∠C=180°

⇒ m∠A+90°+28°=180°

⇒ m∠A=62°

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sin 28^{\circ}=\frac{AB}{AC}

⇒ AC=\frac{16}{sin 28^{\circ}}=34.1units

The length of AC is 34.1 units

3 0
4 years ago
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I hope I've helped! :)

3 0
3 years ago
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