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nata0808 [166]
3 years ago
15

Simplify the expression: b2–3b+7+5b

Mathematics
2 answers:
MArishka [77]3 years ago
6 0
The answer is :

4b+7

hope this helps!!
gavmur [86]3 years ago
6 0

Answer:

b2+2b+7

Step by step explanation:

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A plane is traveling 600 miles. It takes the plane 5 hours against the wind and 4 hours with the wind. What is the speed of the
madam [21]

Answer: the speed of the plane in still air is 135 miles per hour

the speed of the wind is 15 miles per hour

Step-by-step explanation:

Let x represent the speed of the plane in still air

Let y represent the speed of the wind.

The distance travelled by the plane is 600 miles.

Distance travelled = speed × time

It takes the plane 5 hours against the wind. This means that the total speed is (x-y) miles per hour. Therefore,

600 = 5(x- y) = 5x - 5y - - - - - - - 1

It takes the plane 4 hours with the wind. This means that the total speed is (x+y) miles per hour. Therefore,

600 = 4(x+ y) = 4x + 4y - - - - - - - - 2

Multiplying equation 1 by 4 and equation 2 by 5, it becomes

2400 = 20x - 20y

3000 = 20x + 20y

Adding both equations

5400 = 40x

x = 5400/40 = 135

Substituting x = 135 into equation 1, it becomes

4 × 135 + 4y = 600

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4y = 600 - 540 = 60

y = 60/4 = 15

6 0
3 years ago
15x + 45 = 15 (3 + x) always never one solution how do I do it​
const2013 [10]

Answer:

0

Step-by-step explanation:

First, you need to try to get rid of the ().

To do this:

15 * 3 and 15 * x

This makes 45 and 15x after the = , so the formula is now:

15x + 45 = 45 + 15x

Now get the 15x to the left side. When a number switches sides, it becomes negative when positive and positive when negative. So in this case 15x will become -15x and the 45(on the left) becomes - 45

15x - 15x = 45 - 45

Answer: 0

8 0
3 years ago
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It travels a foot each day so it would take 20 days to fall back down to 19
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2 years ago
(x - 5)(5x + 2) = 0 (please help)
barxatty [35]

Answer:

x=-5

Step-by-step explanation:

please tell me if im wrong lol

7 0
3 years ago
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