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Nostrana [21]
3 years ago
13

If a plan can travel 470 miles per hour with the wind and 430 miles per hour against the wind find the speed of the wind and the

speed of the plane in still air.
Mathematics
2 answers:
hjlf3 years ago
6 0
<span><span>470-390=80
80/2=40
The wind is 40 mph
What does find the speed of the wind in still air mean? The wind is not still air!

Do you mean find the speed of the wind or find the speed of the plane in still air? Try reading your post before clicking submit.
470-40=430
390+40=430
The plane in still air goes 430 mph
</span><span>
</span></span>
Evgen [1.6K]3 years ago
5 0
470 subtract 430 would be 40 miles per hour.
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The edge of a cube was found to be 30 cm with a possible error in measurement of 0.2 cm. Use differentials to estimate the maxim
rjkz [21]

Answer:

Maximum volume error = ±540 cm³

Relative error = 0.02

Percentage error = 2%

Step-by-step explanation:

Relative error : The ratio of volume error to the total volume.

Percentage error: The product of relative error and 100.

The volume of a cube is = side^3

v =x³

Differentiate with respect to x

\frac{dv}{dx} = 3x^2

\Rightarrow dv = 3x^2 dx

Here are x = 30 cm and dx= ±0.2 cm

∴ dv = 3×(30 cm)² (±0.2 cm)

      =±540 cm³

The volume of the cube = 30³ cm ³ = 27,000 cm³

Then the relative error

=\frac{dv}{v}

=\frac{540 cm^3}{27,000 cm^3}

= 0.02.

The percentage error

= (0.02×100)

=2%

7 0
3 years ago
The inequality, |x−35|≤6, describes the the range of typing speeds by Ms. Fletcher's students. Find the range of typing speeds f
Natalija [7]

\text{The given  inequality is   } |x−35|≤6

This can be solved as below

|x-35|\leq6 \\ \\ \text{There two possible cases from here}\\ \text{Case-1}\\ \\ x-35\le \:6\\ \\ x-35+35\le \:6+35\\ \\ x\le \:41\\ \\ \text{Case-2}\\ \\ x-35\ge \:-6\\ \\ x-35+35\ge \:-6+35\\ \\ x\ge \:29\\ \\ \text{Hence the required range of solution is}\\ \\ 29\le \:x\le \:41

4 0
3 years ago
Ava's Ice Cream Shop sold 25 sundaes with nuts and 3 sundaes without 10
Inessa [10]

Answer:

7:5 or 5:7

Step-by-step explanation:

4 0
3 years ago
Andre can run 5 miles in 40 minutes. At that rate of speed, how long would it take him to run 10 kilometers? Use the conversion
matrenka [14]

Answer:

50 minutes = B

Step-by-step explanation:

Andre can run 5 miles in 40 minutes

for 1 miles = 40/5 = 8 minutes

  • for 10 kilometres

1 mile = 1.61 kilometres

x = 10 kilometres

x= (10x1)/1.61= 10/1.61 = 6.21miles

  • for 1 miles = 40/5 = 8 minutes
  • 6.21 miles = 8 x 6.21 = 49.689 minutes ≈ 50 minutes = B
7 0
3 years ago
Letters a, b, c, and d are angles measures.
seropon [69]
The answers are:

a = c

c = d

b + d =180 degrees

Here's how:

When a line intersects two parallel lines, then corresponding angles are formed which means the same corners are congruent.

option c = d is considered.

And, because of vertical angles,

a = d is also an answer.

Below is an attached picture of the figure

7 0
3 years ago
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