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Neko [114]
3 years ago
11

Find the sum and express it in the simplest form.(2y^2+9y+4)+(-3y^2-3y-9)

Mathematics
1 answer:
vampirchik [111]3 years ago
8 0
Since the operation between the two sets of parentheses is addition, we don't have to do anything with it, and can remove the parentheses.
Our new expression is: 2y^2+9y+4-3y^2-3y-9

Now, we just add like terms together to solve for the simplest form of the expression.
2y^2+9y+4-3y^2-3y-9
(2-3)y^2+(9-3)y+(4-9)
-y^2+6y-5

Our final answer is -y^2+6y-5.
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I need help with Question 14 . I need to submit it by monday...<br> Pls help
GaryK [48]

Answer:

Distance between A and B is 5400 meters

Step-by-step explanation:

Consider "D" the letter to identify distance between A and B

Let's use "t" to identify the time of the first encounter (Devi and Kumar), and create an equation that states that the distance covered by Devi (at 100 m/min) in time "t", is equal to the total distance D minus what Kumar has covered at his speed (80 m/min) in that same time:

Recall that distance equals the speed  times the time:

distance= speed * time

First encounter:

100 * t = D - 80 * t

180 * t = D    Equation (1)

Not, 6 minutes later (at time t+6) , Devi and Li Ting meet .

Then for this encounter the distance covered by Devi equals total distance d minus the distance covered by Li Ting:

100 *(t+6) = D - 75 * (t+6)

100 t + 600 = D - 75 t - 450

175 T + 150 = D    Equation (2)

Now, let's equal equation (1) to equation (2), since D should be the same:

180 t = 175 t + 150

5 t = 150

t = 30

Then the time t (first encounter) is 30 minutes. Knowing this, we can use either equation to find D:

From Equation (1) for example: D = 180 * t = 180 * 30 = 5400 meters

5 0
3 years ago
On a coordinate plane, a curved line labeled f of x with a minimum value of (1.9, negative 5.7) and a maximum value of (0, 2), c
Bumek [7]

Answer:

4.F(x) > 0 over the intervals (-0.7, 0.76) and (0.76, ∞).

Step-by-step explanation:

6 0
2 years ago
2. Use the distributive property to rewrite the following expression.<br> 3(x+5)
baherus [9]

The answer is 3x+15

You multiply the x and 5 by 3 to get 3x and 15

6 0
3 years ago
Someone, PLeaSe help if I don't get these answer DONE then I won't GET my eletronics back,
lara [203]

Answer:

540 in2

Step-by-step explanation:

18×3=54×10=540

5 0
2 years ago
Can some one just tell me if these are right? If not can I have the answers?
-Dominant- [34]
Yes you have them correct
6 0
3 years ago
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