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nirvana33 [79]
3 years ago
9

Find the product. (−x−3)(2x2+5x+8)=

Mathematics
1 answer:
harina [27]3 years ago
3 0

( - x - 3)(2 {x}^{2}  + 5x + 8) =  \\  =  - 2 {x}^{3}  - 5 {x}^{2}  - 8x - 6 {x}^{2}  - 15x - 24 =  \\  =  - 2 {x}^{3}  - 11 {x}^{2}  - 23x - 24

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A 25% acid solution must be added to a 40% solution to get 240 liters of 30% acid solution. How many of each should be used ?
schepotkina [342]

Answer:

The number of liters of 25% acid solution = x = 160 liters

The number of liters of 40% acid solution = y = 80 liters

Step-by-step explanation:

Let us represent:

The number of liters of 25% acid solution = x

The number of liters of 40% acid solution = y

Our system of Equations =

x + y = 240 liters....... Equation 1

x = 240 - y

A 25% acid solution must be added to a 40% solution to get 240 liters of 30% acid solution.

25% × x + 40% × y = 240 liters × 30%

0.25x+ 0.4y = 72...... Equation 2

We substitute 240 - y for x in Equation 2

0.25(240 - y)+ 0.4y = 72

60 - 0.25y + 0.4y = 72

Collect like terms

- 0.25y + 0.4y = 72 - 60

0.15y = 12

y = 12/0.15

y = 80 Liters

Solving for x

x = 240 - y

x = 240 liters - 80 Liters

x = 160 liters

Therefore,

The number of liters of 25% acid solution = x = 160 liters

The number of liters of 40% acid solution = y = 80 liters

5 0
2 years ago
How many solutions does the system of equations below have?
lina2011 [118]
The answer is infinitely many solutions.
If you graph them both are a straight line which means they are infinite
8 0
3 years ago
Tom has 12 reports to file. If each report takes an average of 45 minutes to file, how long will it take him to file 75% of them
Jobisdone [24]

Alright, lets get started.

One report takes to file an average of = 45 minutes

Means 12 reports takes to file time = 12 * 45 = 540 minutes

12 reports filing total time = 540 minutes

We are asked to find time to file 75 % of them.

Which means 75 % of 540

= 540 * 75/100

= 540 * 0.75

= 405 minutes

We could convert it into hrs dividing with 60.

405 / 60 = 6.75 hrs

Means it will take 6.75 hrs to file 75% of them: Answer

Hope it will help :)

8 0
2 years ago
If sin=3/5 then what cos equal to
kap26 [50]

\sin {}^{2} ( \alpha )  +  \cos {}^{2} ( \alpha )  = 1
\frac{9}{25}  +  \cos {}^{2} ( \alpha )  = 1
\cos {}^{2} ( \alpha )  =  \frac{16}{25}
\cos( \alpha )  =  \frac{4}{5}
8 0
2 years ago
Read 2 more answers
How many sunsets of at least one element does a set of six elements have
Lesechka [4]

Answer:

63

Step-by-step explanation:

Given:

a set of six elements  

The solution would be like this for this specific problem:

number of subsets of n elements = 2^n

(2^6) - 1

= 64 – 1

= 63

7 0
2 years ago
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