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lawyer [7]
3 years ago
14

You estimate that there are 66 cars in a parking lot. The actual number of cars is 75.

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
7 0
IDK but go to my pro file to help youuuuuuuuuuuuuuuuuuuuuuu

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What expression can be used for estimating 868÷29?
Lelu [443]
One expression u can use is 900÷30
Round 868 up to 900
and round 29 up is 30
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3 years ago
Two-thirds of the buses in the transit system run on natural gas, and the rest run on diesel. If 738 of the buses run on diesel,
Airida [17]

Answer:

2214 buses

Step-by-step explanation:

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2 years ago
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Find the sine of ZI. J 21 D I Write your answer in simplified, rationalized form. Do not round.​
Kitty [74]
What is ZI? Can you specify? thanks
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WILL GIVE BRAINLIEST<br><br> Which is the correct piecewise definition for the function y=|x+5|-2
kvasek [131]

Answer:

{y= x+3 x ≥ - 5

{y= −x −7 x < -5

8 0
3 years ago
Which of the following functions are solutions of the differential equation y" + y = 7 sin(x)? (Select all that apply.)
Nikitich [7]

The homogeneous equation

y'' + y = 0

has characteristic equation

r² + 1 = 0

with roots at r = ± √(-1) = ± i, and so the characteristic solution is

y = C₁ cos(x) + C₂ sin(x)

Using the method of undetermined coefficients, suppose

y = a x cos(x) + b x sin(x)

(we would normally consider y = a cos(x) + b sin(x), but cos(x) and sin(x) are already part of the characteristic solution)

The derivatives are

y' = a cos(x) - a x sin(x) + b sin(x) + b x cos(x)

y' = (b - a x) sin(x) + (a + b x) cos(x)

and

y'' = -a sin(x) + (b - a x) cos(x) + b cos(x) - (a + b x) sin(x)

y'' = (-2a - b x) sin(x) + (2b - a x) cos(x)

Then

y'' + y = (-2a - b x) sin(x) + (2b - a x) cos(x) + a x cos(x) + b x sin(x)

7 sin(x) = -2a sin(x) + 2b cos(x)

and it follows that a = -7/2 and b = 0.

So, the general solution to the DE is

y = C₁ cos(x) + C₂ sin(x) - 7/2 x cos(x)

which means the only valid solutions from the given choices are

y = 7 sin(x)

y = 7 cos(x)

4 0
2 years ago
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