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Tems11 [23]
3 years ago
9

From the top of a vertical tower 248 m high , a stone is projected vertically downwards with a speed of 8 ms . After x seconds a

nother stone is projected vertically upwards from the level of the base of the tower with a speed 25 ms . Given that two stones are at same height moving in the same direction 6 seconds after projection of the first stone , calculate :
1) value of x
2) the velocity of the second stone at this instant
Mathematics
1 answer:
Valentin [98]3 years ago
4 0
It is 2 that what i got and i think i got it write if not delete 

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Solve similar triangles (basic)
fiasKO [112]

Answer:

<em>T </em><em>=</em><em> </em><em>1</em><em>6</em>

Step-by-step explanation:

As triangles are similar

AB/DE = BC/EF = AC/DF

13.5/18 = 6/4 = 12/T

3/4 = 3/4 = 12/T

3/4 = 12/T

T = 12×4/3

T = 16

4 0
2 years ago
Consider the inequality -5(x+7)&lt;-10 write inequality representing a solution for x
dedylja [7]
Perform indicated multiplication on left side first...

-5x-35<-10  add 35 to both sides

-5x<25  divide both sides by -5 (you must reverse sign because of division by a negative value too!)

x>5  or if you prefer...

x=(5, +oo)
6 0
3 years ago
Help me Please please people I believe you can help me...
Andrei [34K]

Answer:

A.)  9pencils

B.)   6 more Pencils than markers

Step-by-step explanation:

A.)1.08/ 0.12 = 9

B.) 2.18 - 1.08 = $1.10

1.10 / .36 = 3 Markers

HAVE A GREAT DAY!!! :)

8 0
3 years ago
Read 2 more answers
You are designing a 1000 cm^3 right circular cylindrical can whose manufacture will take waste into account. There is no waste i
asambeis [7]

Answer:

 h /r  =  2.55

Step-by-step explanation:

Area of a can:

 Total area of the can = area of (top + bottom)  + lateral area

lateral area  2πrh    without waste

area of base (considering that you use 2r square)  is 4r²

area of bottom      ( for same reason )                           4r²

Then Total area  =  8r² + 2πrh

Now can volume is   1000 = πr²h        h = 1000/πr²

And  A(r)  =   8r² + 2πr(1000)/πr²

A(r)  =   8r² + 2000/r

Taking derivatives both sides

A´(r)   =  16 r    - 2000/r²

If A´(r)  =  0              16 r    - 2000/r²   = 0

(16r³  - 2000)/ r²  =  0        16r³  - 2000  =  0

r³  =  125      

r = 5 cm      and      h  = ( 1000)/ πr²      h  = 1000/ 3.14* 25

h = 12,74  cm

ratio   h /r  =  12.74/5         h /r  =  2.55

   

5 0
3 years ago
Please help! 9th grade math
Rzqust [24]

Answer:

They switched the w and the -15 at the end

Step-by-step explanation:

When you switch the inequality sign after multiplying or dividing a number, the variable stays on the side its on, even if it looks weird.

5 0
3 years ago
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