All categories

3 years ago

Someone help me please

Mathematics

1 answer:

Salsk061 [2.6K]3 years ago

5 0

Important notes:

3 sides 1 angle - COSINE RULE

2 sides 2 angle - SINE RULE

since, the question wants to find the length of BC. In the end we will have 3 sides and 1 angle and use cosine rule

formula of cosine rule:

a² = b² + c² - 2bc Cos A° (to find the length)

Cos A° = b² + c² - a² / 2bc ( to find the angle, if there is given three sides and have to find the angle)

So just substitute,

a² = 13² + 15² - 2(13)(15) Cos 95°

a = 20.6 or 21

You might be interested in

Find the derivative of y=x²+3x

Scorpion4ik [409]

Answer:

$\frac{dy}{dx}$ = 2x + 3

Step-by-step explanation:

Differentiate each term using the power rule

$\frac{d}{dx}$ (a $x^{n}$ ) = na $x^{n-1}$

y = x² + 3x

$\frac{dy}{dx}$ = 2 $x^{(2-1)}$ + 3 $x^{(1-1)}$

= 2x + 3 $x^{0}$

= 2x + 3

7 0

3 years ago

2 Points

vfiekz [6]

Answer:

$63

Step-by-step explanation:

Penny = $0,01
Nickel = $0.05
Dime = $0.1
Quarter= $0.25

Number of pennies = 6*50 = 300
Number of nickels = 5*40= 200
Number of dimes = 4*50= 200
Number of quarters = 3*40 = 120

<u>Total amount of money:</u>

300*0.01+ 200*0.05 + 200*0.1 + 120*0.25 = $63

5 0

3 years ago

Read 2 more answers

In the outsiders Johnny kills a soc.

Nezavi [6.7K]

Answer:

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

How many tissues does a carrot contain?<br>Explain your reasoning.

zepelin [54]

Answer:

khv-hjsb-qwc. join in meet all

6 0

3 years ago

The question is in the photo.

netineya [11]

Answer:

0.8

0.4

Step-by-step explanation:

y = 5x

Substituting '5':

5 = 5x

x = 5/5

x = 1

Substituting 4:

4 = 5x

x = 4/5

x = 0.8

Substituting 2:

2 = 5x

x = 2/5

x = 0.4

5 0

3 years ago

Read 2 more answers