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Arisa [49]
3 years ago
6

Please help will give brainliest

Mathematics
1 answer:
marysya [2.9K]3 years ago
5 0

Answer:

19°

Step-by-step explanation:

In triangle ABC, ∠A=120°, a=8, b=3.

Use the sin rule:

\dfrac{a}{\sin \angle A}=\dfrac{b}{\sin \angle B}\\ \\\dfrac{8}{\sin 120^{\circ}}=\dfrac{3}{\sin \angle B}\\ \\8\sin \angle B=3\sin 120^{\circ}\\ \\8\sin \angle B=3\cdot \dfrac{\sqrt{3}}{2}\\ \\\sin \angle B=\dfrac{3\sqrt{3}}{16}\approx 0.3248\\ \\\angle B\approx 18.95^{\circ}\approx 19^{\circ}

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Plz Help .............​
Rus_ich [418]

363.9ft^{2}

Step-by-step explanation:

Area =\pi r^{2} -\frac{1}{3}\pi r^{2}  +\frac{1}{2}r^{2}sin\alpha \\\\\\   = \frac{2}{3}\pi 12^{2} +\frac{1}{2}12^{2}sin120 =363.9ft^{2}

5 0
3 years ago
Read 2 more answers
1. Which equation should be used to find the area of the triangle below? *
77julia77 [94]

Answer:

See Explanation

Step-by-step explanation:

Required

Expression for area of triangle

This is calculated using

Area = \frac{1}{2} * base * height

Assume that:

base = 5cm; height = 2cm

The equation becomes

Area = \frac{1}{2} * 5* 2

8 0
2 years ago
Roberto is 3 years older than Carolyn. In 7 years the sum of their ages will be 81. How old is Roberto now?
Nuetrik [128]

Answer: 35

the age of Roberto is x (x > 3)(x ∈ N)

because Roberto is 3 years older than Carolyn => the age of Carolyn is x - 3

in 7 years, the age of Roberto is x + 7; the age of Carolyn is x - 3 + 7 = x + 4

because  In 7 years the sum of their ages will be 81 =>

x + 7 + x + 4 = 81

⇔ 2x + 11 = 81

⇔ 2x = 70

⇔ x = 70/2 = 35

=>  the age of Roberto is 35

Step-by-step explanation:

3 0
2 years ago
Hello does anyone know how to solve this?
Radda [10]

Hello from MrBillDoesMath!

Answer:    2 ^ -4  ( = 1/16)

Discussion:

- 4 log {8} 2            {8} is used instead of subscript notation


Basic property of logarithms is that exponents become multipliers and vice versa:


-4 log {8} 2 =  log {8}   (2^ -4)



Thank you,

MrB

5 0
3 years ago
Which is equivalent to 80^ 1/4
11Alexandr11 [23.1K]

Answer:

B) \sqrt[4]{80} ^x

Step-by-step explanation:

The given expression is 80^{\frac{1}{4} x}

It is 4th root. because 1/4 represents the 4th root.

So, \sqrt[4]{80} ^x

Therefore, the answer is B) \sqrt[4]{80} ^x

5 0
3 years ago
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