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Cerrena [4.2K]
2 years ago
14

Help me i'll help you back

Mathematics
1 answer:
Dmitriy789 [7]2 years ago
8 0

Answer:

A, C, B, respectively

Step-by-step explanation:

science(density and buoyancy)

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2x + 4 = 10<br> Solve for x
Goshia [24]

Answer:

x = 3

Step-by-step explanation:

2x + 4 = 10

-4. -4

(2x = 6) ÷ 2

x = 3

7 0
3 years ago
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An envelope is 3 inches wide, and it measures 7 inches along the diagonal. What is the envelope’s length? If necessary, round to
Crank

The length of the envelope is 6.3 inches

Step-by-step explanation:

Width of the envelope = 3 inches

Diagonal of the envelope = 7 inches

To find:

The length of the envelope.

Let the length of the envelope be 'l'

We can use pythogoras theorem to calculate the length.

l = √(49-9)

l = √(40)

l = 6.3 inches

The length of the envelope is 6.3 inches

7 0
3 years ago
An American tourist visits South Africa with $3000. The exchange rate when she arrives is
algol [13]

9514 1404 393

Answer:

  $2505.80

Step-by-step explanation:

After the first exchange, the tourist has ...

  $3000(12.90 R/$) = R38,700

After 7 days, she has ...

  R38,700 -7(R900) = R32,400

After the second exchange, she has ...

  R32,400 × ($1/R12.93) = $2505.80

She gets $2505.80 at the second exchange.

8 0
2 years ago
Find cos 18, sin 18. cos 3x=sin2x then x=18.
Rzqust [24]
X = 18°
cos 54° = sin 36°
cos 3 x = sin 2 x
cos ( 2 x + x ) = sin 2 x
cos 2 x cos x - sin 2 x sin x = 2 sin x cos x
( cos² x - sin² x ) cos x - 2 sin² x cos x = 2 sin x cos x   / : cos x
                                                                         ( divide both sides by cos x )
cos² x - sin² x - 2 sin² x = 2 sin x
1 - sin² x - 3 sin² x - 2 sin x = 0
- 4 sin² x - 2 sin x + 1 = 0               substitution:  u = sin x
- 4 u² - 2 u + 1 = 0
u = 2 -√20 / - 4        sin 18° =  (√ 5 - 1 )/4 
sin 18 =  \frac{ \sqrt{5} -1 }{4}
cos 18° = √( 1² - ((√5 - 1)/4)²
cos 18° = (10+2√5)^(1/2) / 4

6 0
2 years ago
while preparing for a morning conference, principal corsetti is laying out 15 dozen bagels on square plates. each plate can hold
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Do 15x12 then divide your answer by 14
6 0
3 years ago
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