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grandymaker [24]
3 years ago
9

The speed of sound in dry air at 20° C (68° F) is 1.236 × 103 km/h. What is the speed of sound written as an ordinary number?

Mathematics
1 answer:
defon3 years ago
7 0

Step-by-step explanation:

The speed of sound has nothing to do with "sea level" and sound pressure and without the medium air there is no speed of sound. In SI units with dry air at 20°C (68°F), the speed of sound c is 343 meters per second (m/s). This also equates to 1235 km/h, 767 mph, 1125 feet per second (ft/s), or 666 knots.

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Write two different rational functions whose graphs have the same end behaviour as the graph of y=3x^2
baherus [9]

Answer:

               y=x^2+5x+20\\ \\ y=8x^2+35

Explanation:

The <em>end behavior</em> of a <em>rational function</em> is the limit of the function as x approaches negative infinity and infinity.

Note that the the values of even functions are the same for ± x. That implies that their limits for ± ∞ are equal.

The limits of the quadratic function of general form y=ax^2+bx+c as x approaches negative infinity or infinity, when a  is positive, are infinity.

That is because as the absolute value of x gets bigger y becomes bigger too.

In mathematical symbols, that is:

\lim_{x \to -\infty}3x^2=\infty\\ \\ \lim_{x \to \infty}3x^2=\infty

Hence, the graphs of any quadratic function with positive coefficient of the quadratic term will have the same end behavior as the graph of y = 3x².

Two examples are:

         y=x^2+5x+20\\ \\ y=8x^2+35

5 0
3 years ago
Nathan is itemizing deductions on his federal income tax return and had $5800 in his medical expenses last year. If his AGI was
victus00 [196]

Multiply his AGI by 7.5% to find the amount medical needs to meet before deducting:


46,000 x 0.075 = $3,450


He can deduct any amount over $3450.

Subtract that from his medical total to find the amount he can deduct:


5800 - 3450 = 2350


He can deduct $2,350.


6 0
3 years ago
Read 2 more answers
I need help pls someone
Solnce55 [7]

In this question they've given us the formula and they just want us to plug in the numbers and get the value.


P is the original value, P=$600


r is the depreciation rate, r=10%=0.1


t is the time in years, t=2


A = P(1-r)^t = 600(1 - 0.1)^2 = 600 \cdot .9^2 = 486


Answer: $486






7 0
3 years ago
What should be the first step in adding these equations to eliminate y?
ElenaW [278]

Answer:

D

Step-by-step explanation:

5 0
3 years ago
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The measures of the angles of a triangle are shown in the figure below. Solve for x.
MissTica

Answer: X= 25 degrees

Step-by-step explanation:

A triangle is 180 degrees.

115+40=165

180-165=25 degrees

6 0
3 years ago
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