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3 years ago

Plz help i will mark brainliest

Mathematics

2 answers:

Andru [333]3 years ago

8 0

1. -|12|
2. -5
3.-1
4.|-1|
5.12

bulgar [2K]3 years ago

4 0

Answer:

1. -|12|

2. -5

3. -1

4. |-1|

5. 12

Step-by-step explanation:

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Gnesinka [82]

Answer:

a range of values such that the probability is C % that a rndomly selected data value is in that range

Step-by-step explanation:

complete question is:

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3 years ago

HI decomposes into its elements according to second-order kinetics. What concentration of HI remains from an initial concentrati

Novosadov [1.4K]

Answer:

Therefore (2.30-0.03747)= 2.2625 M of HI remains from an initial concentration of 2.30 M after 4.5 hours.

Step-by-step explanation:

second order reaction: The rate of reaction proportional to the square of the concentration of reactant.

For second order reaction

$k=\frac{x}{ta(a-x)}$

K is rate constant = 1.6×10⁻³M⁻¹hr⁻¹

a = initial concentration of reactant = 2.30 M

a-x = concentration of reactant after t h

t = time = 4.5 h

Putting the values in the above equation,

$1.6\times 10^{-3}= \frac{x}{4.5 \times 2.30 \times (2.30-x)}$

$\Rightarrow 16.56 \times 10^{-3}\times (2.30-x)= x$

$\Rightarrow 16.56 \times 10^{-3}\times 2.30-16.56 \times 10^{-3}\times x= x$

$\Rightarrow (1+16.56 \times 10^{-3}) x=16.56 \times 10^{-3}\times 2.30$

$\Rightarrow x = 0.03747$

Therefore (2.30-0.03747)= 2.2625 M of HI remains from an initial concentration of 2.30 M after 4.5 hours.

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4 years ago

Ms. Dyna a mathematics teacher has a salary of 120 000$ per month, if salary increases by 9% calculate the amount of extra she r

Studentka2010 [4]

Answer:

129,000

Step-by-step explanation:

8 0

3 years ago

Find the distance between A and B.

Goryan [66]

Answer: a. 34

Step-by-step explanation:

7 0

3 years ago

1. For centuries, mathematicians believed that quadratic equations, like the one below, had no solutions and were not solvable.

7nadin3 [17]

Answer:

See below.

Step-by-step explanation:

(a) Because the solution led to a square root of a negative number:

x^2 -10x+40=0

x^2 - 10x = -40 Completing the square:

(x - 5)^2 - 25 = -40

(x - 5)^2 = -15

x = 5 +/-√(-15)

There is no real square root of -15.

(b) A solution was found by introducing the operator i which stands for the square root of -1.

So the solution is

= 5 +/- √(15) i.

These are called complex roots.

x^2 - 10 + 40:

((5 + √(-15)i)^2 - 10(5 + √(-15)i) + 40

= 25 + 10√(-15)i - 15 - 50 - 10√(-15)i + 40

= 25 - 15 - 50 + 40

= 0. So this checks out.

Now substitute 5 - √(-15)i

= 25 - 10√(-15)i - 15 - 50 + 10√(-15)i + 40

= 25 - 15 - 50 + 40

= 0. This checks out also.

8 0

3 years ago