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mafiozo [28]
3 years ago
6

(2x3 - 9x2 - 5) -(-6x2 + 4x + 2) Find the sum or difference

Mathematics
1 answer:
Norma-Jean [14]3 years ago
7 0

Step-by-step explanation:

(2 {x}^{3}  - 9 {x}^{2}  - 5) - ( - 6 {x}^{2}  + 4x + 2) \\  = 2 {x}^{3}  - 9 {x}^{2}  - 5 + 6 {x}^{2}  - 4x - 2 \\  = 2 {x}^{3}  - 9 {x}^{2}+ 6 {x}^{2} - 4x - 5 - 2 \\  = 2 {x}^{3}  - 3 {x}^{2} - 4x - 7

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What is the difference? −15 − (−3)
klasskru [66]
The answer is -12 bc you take away the 3
3 0
1 year ago
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Please help i’m doing trying to do my gf work please i’ll give you brainliest
otez555 [7]

Answer:

t = 5 seconds h = 128 feet

Step-by-step explanation:

The given equation of the object is :

h(t)=-16t^2+64t+80 .....1

When it hits the ground,

h(t) = 0

So,

-16t^2+64t+80=0\\\\t=-1\ s\ and\ t=5\ s

The object will hit the ground in 5 seconds.

Now, put t = 1 s in equation (1).

h(1)=-16(1)^2+64(1)+80\\\\h(t)=128\ ft

The object is at a height of 128 ft at 1 second.

7 0
3 years ago
2) A bike racer completed a 20.0 kilometer race. She pedaled the first 5.0 kilometers with an average speed of 20.0 km/hr. She p
MakcuM [25]

Answer:

Step-by-step explanation:

Time = distance/speed

Considering the first stage,

Speed = 20km/hr

Distance = 5km

Time = 5/20 = 0.25 hour

Considering the second stage,

Speed = 10km/hr

Distance = 5km

Time = 5/10 = 0.5 hour

Considering the third stage,

Speed = 25km/hr

Distance = 5km

Time = 5/25 = 0.2 hour

Considering the third stage,

Speed = 20km/hr

Distance = 5km

Time = 5/20 = 0.25 hour

Therefore, the time it took the biker to complete the race is

0.25 + 0.5 + 0.2 + 0.25 = 1.2 hours

8 0
4 years ago
Mr. Mandel gave his class 12 minutes to read. 5 1/2 pages in that time. At what rate, in pages per hour, did Claire read?
Eva8 [605]
5 1/2 pages in 12 minutes.
11/2 pages in 12 minutes 

How many pages in an hour?
well, an hour has 60 minutes

Let's write a proportion
11/2 / 12 = x/60
cross multiply
(11/2 * 60) = 12x
330 = 12x
divide both sides by 12
27.5 or 27 1/2 = x

27.5 pages per hour.

Hope this helps
8 0
3 years ago
An equilateral triangle has a perimeter of 60 meters and s height of 17.3 meters. What is the area of the triangle
mixer [17]

Answer:

A = 173 m²

Step-by-step explanation:

P = 60m = 3L => L = 60 : 3 = 20 m

A = L×h/2 = 20m×17.3m/2 = 10m×17.3m = 173 m²

6 0
3 years ago
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