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ziro4ka [17]
3 years ago
5

15/8 + (-3 4/7) plz help me.

Mathematics
1 answer:
givi [52]3 years ago
4 0
I think it’s -1.69642857143
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Pls help with Question 11.<br> I need to submit it by tmr
Wewaii [24]

Answer: 81.85 km/hr

Converting m/sec into km/hr, 25 m/sec = 90 km/hr

Average =

Time = 50/90  =  5/9 hr

next 120 km at an average speed of 80km/h

=> Time = 120/80  = 3/2  hr

last part of its journey at an average speed of 90km/h in 35 Minutes

time = 35 minutes = 35/60 hr = 7/12 hr

Distance covered = 90 * 7 /12  = 105/2  km

Total Distance = 50 + 120  + 105/2  = 435/2 km

Total time = 5/9 + 3/2 + 7/12   =  ( 20 + 54 + 21) /36  = 95/36

Average speed =   (435/2)/(95 /36)  = 432 * 18  /95 = 81.85 km/hr

8 0
3 years ago
A bridge constructed over a bayou has a supporting arch in the shape of an inverted parabola. Find the equation of the parabolic
babymother [125]

Answer: f(x) = -0.016x² + 1.6x

Step-by-step explanation:

If the lenght of the road over the arch is 100m, we can consider a coordinate plane and say that the road starts at point (0,0) and finishes at (100,0). The vertice of the parabola is at point (50,40), because the maximum height is 40 and it is always in the middle point of the roots.

So, we have

(0,0) (50,40) (100,0)

A quadratic function is always on the form: f(x) = ax² + bx + c

0 = a0² + b0 + c

40 = a50² + b50 + c

0 = a100² + b100 + c

0 = a0² + b0 + c → c = 0 ∴

40 = a50² + b50

0 = a100² + b100

_________________________

2500a + 50b = 40 (*2)

10000a + 100b = 0

_________________________

5000a + 100b = 80

10000a + 100b = 0 (-)

__________________________

-5000a = 80

-a=80/5000

a=-0.016

∴

2500a + 50b = 40

2500.(-0.016) + 50b = 40

-40 + 50b = 40

50b = 80

b = 80/50

b = 1.6

This way f(x) = -0.016x² + 1.6x

6 0
3 years ago
Please graph y= 1/2x–3<br> Please i need help with this &lt;3
erik [133]

Answer:

coordinates are 6, -3

Step-by-step explanation:

When it's plotted out onto a graph, the answer comes down to 6, -3 (also remember, it's X then Y)

6 0
3 years ago
Which inequality has no solution?<br> 6(x+2) &gt; x-3<br> 3+4x2(1+ 2x)<br> -2(x+6) X-9 &lt;3(x-3)
Juli2301 [7.4K]

Answer:

6(x + 2) > x - 3

6x + 12 >  x - 3

6x - x >  - 12 - 3

5x >  - 9

3 + 4 \times 2(1 + 2x)

3 + 8(1 + 2x)

3 + 8 + 16x

11 + 16x

- 2(x + 6)x - 9 < 3(x - 3)

- 2( {x}^{2}  + 6x) - 9 < 3x - 9

- 2 {x}^{2}  - 12x - 9 < 3x - 9

5 0
3 years ago
Disneyland sells adult passes for $60 and youth passes for $30. In one day, 360 passes were sold for a total of $14,520. How man
Zina [86]

Answer:

Step-by-step explanation:

Pretty much is only with breathing. If a person has asthma, the inside of these airways is irritated and swollen. Asthma can cause shortness of breath, wheezing, coughing, and tightness in the chest. For some people, asthma symptoms only appear when they are exposed to something that irritates their breathing. Others have a kind of asthma that makes breathing difficult all of the time.

4 0
3 years ago
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