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Solnce55 [7]
3 years ago
9

NEED HELP QUCKILY PLZ HURRY

Mathematics
2 answers:
ratelena [41]3 years ago
4 0

Answer:

The third one is right.

Step-by-step explanation:

Rasek [7]3 years ago
4 0

statement no 3 is true.

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AnnZ [28]
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Sin (cos X/sin X )
Cos X.

I believe the correct answer is cos X.
4 0
3 years ago
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VikaD [51]
I hope this helps you 2 (B+4)=3 B+4=3/2 B=3/2-4 B=-5/2
5 0
3 years ago
A dog jumps straight up. Y=-16t^2+20t models the motion of the dog, where "t" is the time in seconds and "y" is the height of th
alina1380 [7]

Answer:

Step-by-step explanation:

The motion of the dolphin is quadratic

i.e y=-16t²+20t

To get the maximum height the dolphin will reach

We need to find the point of inflexion. i.e dy/dt=0

dy/dt=-32t+20

Then set dy/dt=0

0=-32t+20

Then, -32t=-20

t=0.625

Let find d²y/dt²

d²y/dt²=-32. Since this is negative then the point t=0.625 is the maximum point the dolphin can reach

Then substitute t=0.625 into y

y=-16t²+20t

y=-16(0.625)²+20(0.625)

y=6.25ft

Then the maximum height the dolphin can reach is 6.25ft

Using discriminant

Formular method

y=-16t²+20t

So the dog height y<7

y=-16t²+20t <7

-16t²+20t-7<0

a=-16, b= 20. c=-7

t=(-b±√b²-4ac)/2a

Using the a, b and c direct for the discriminant

D=b²-4ac

D=20²-4×-16×-7

D=-48

Which is a complex number

Then the dolphin can reach the height

Then we need to model the D to be greater than 0

Therefore,

D>0

b²-4ac>0

We cannot do anything to a and b it is already given

a=-16, b=20

(20)²-4(-16c)>0

400+64c>0

64c>-400

Then

c>-6.25

Divide both side by - and the inequality sign will change

Therefore -c<6.25

So the dog height y<6.25

y=-16t²+20t <6.25

Therefore the maximum height is 6.25.

If it is greater than that then, we are going to have a complex root movement which is not possible for the dolphin .

5 0
3 years ago
There are 134 third graders and 167 fourth graders at the annual school and family picnic. the number of students is 7 times the
grandymaker [24]
I got 39 tables.
134+167=301
301/7=43
Total amount of people =344
344/9=38.222 which you would round to 39 tables
4 0
4 years ago
amy borrows $130 to buy supplies for her birthday party. she receives gifts and money from her friends and family. the total amo
OLga [1]

Answer:

Step-by-step explanation:

If Amy received 250 dollars for her bday, but she borrowed before 130,

she will have left:

250-130=120 dollars

3 0
3 years ago
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