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a_sh-v [17]
3 years ago
15

Help me with 18 19 and 20 plz

Mathematics
1 answer:
Rzqust [24]3 years ago
6 0
19: He multiplied instead of dividing which will make a totally incorrect answer
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Hello again, need help on this question.
meriva

Answer:

Step-by-step explanation:

2 18

3 0
3 years ago
Why does a siren have a higher pitch as it approaches you?
Airida [17]

Answer:

Apparent Increase in Wave Frequency

As the ambulance approaches you, the distance between the source of the waves and the observer decreases. Consequently, the siren sounds more shrill as the pitch of the wailing siren 'sounds' higher than its original value, as sound waves reach you 'more frequently'.

Step-by-step explanation

hope this helps

7 0
3 years ago
Read 2 more answers
A 13foot lader i upagenst a tree the bottom of the ladder is 5 feet away form the tree how high is the ladder on the tree
SCORPION-xisa [38]

Think of the 13-ft length of the ladder as the hypotenuse of a right triangle. Represent the horiz. distance from foot of ladder to base of tree by x, or 5 ft.

Represent the vert. dist. from base of tree to top of ladder by y, which is unknown.


Then (13 ft)^2 = (5 ft)^2 + y^2, or


169 ft^2 = 25 ft^2 + y^2. This simplifies to y^2 = 144. Thus y = + 12 feeet.


Note: Please pay attention to your spelling: "lader i up agenst a tree" should be "the top of a 13-ft ladder is placed against a tree."

7 0
3 years ago
Which one of the following is an example of a proper fraction a7/6 b4/4 c3/4 d 4/3
Sergio039 [100]
A proper fraction is when the numerator is smaller then the denominator .
so ur answer is 3/4

** fractions are improper if the numerator is bigger then the denominator.
and when the numerator and denominator are the same, the fraction equals 1
4 0
3 years ago
Read 2 more answers
WORTH 98 POINTS
LUCKY_DIMON [66]

Answer:

The equation is -3x^2 + 30x + 225 = 0, and the number of days is 15.

Step-by-step explanation:

I assume an x is missing, and the function is h(x) = -3x^2 + 30x + 225

You want to know the number of days in which the function value is zero.

-3x^2 + 30x + 225 = 0

Divide both sides by -3.

x^2 - 10x - 75 = 0

(x - 15)(x + 5) = 0

x - 15 = 0 or x + 5 = 0

x = 15 or x = -5

We discard the negative solution.

Answer: The equation is -3x^2 + 30x + 225 = 0, and the number of days is 15.

5 0
4 years ago
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