## Forum Replies Created

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**Correct answer is option (d)****Explanation:**

For option**(d)**

log with base 3 (-2x-3) = 2

=> -2x – 3 = 3^2

=> -2x – 3 = 9

=> -2x = 12

=>**x = -6**- This reply was modified 2 years, 11 months ago by ProtonsTalk.

July 19, 2021 at 8:35 pm in reply to: What is the oxidation state of each element in Mn(CrO4)2 ? #10376::Mn(2+), Cr(6+), O(-2)

**Explanation:**The typical oxidation state of

*oxygen*is -2.*Manganese*typically takes a +2 oxidation state. This leaves*chromium*to balance the oxidation state(the oxidation states must sum to zero in a neutral compound).Thus, 2 – 8 + Cr = 0

We have

**Cr(6+)**which is its maximum**oxidation number**.- This reply was modified 2 years, 11 months ago by ProtonsTalk.
- This reply was modified 2 years, 11 months ago by ProtonsTalk.

July 19, 2021 at 7:26 pm in reply to: A line contains points M(1, 3) and N(5, 0). What is the slope of MN? #10317::**Answer:**

Slope of a line, m = (y_{2}-y_{1}/x_{2}-x_{1})

=> m = ( (0-3)/(5-1) )

=> m = -3/4**∴ the correct option is (b)**- This reply was modified 2 years, 11 months ago by ProtonsTalk.

July 19, 2021 at 7:58 pm in reply to: If a(x)=3x+1 and b(x)=(x-4)^1/2, what is the domain of (b o a)x? #10357::**Answer:**

**Given:**a(x) = 3x+1 , b(x) = (x-4)^1/2(b o a)(x) = b(a(x))

= b(3x+1)

= ((3x+1)-4)^1/2

= (3x-3)^1/2

= 3(x-1)^1/2So, the domain of x should be greater than equal to 1

i.e.**x belongs to (1,infinity)**Therefore the correct answer is

**(c)**.- This reply was modified 2 years, 11 months ago by ProtonsTalk.
- This reply was modified 2 years, 11 months ago by ProtonsTalk.

July 19, 2021 at 8:12 pm in reply to: For Mn^3+ write an equation that shows how the cation acts as an acid. #10370::The equations that shows Mn^3+ acts as an acid are

- [Mn(H2O)6]^+3 + H2O —-> [MnOH(H2O)5]^+2 + H3O^+
- Mn^3+(aq) + H2O(l) ⇌ Mn(OH)^2+(aq) + H^+(aq)

- This reply was modified 2 years, 11 months ago by ProtonsTalk.
- This reply was modified 2 years, 11 months ago by ProtonsTalk.
- This reply was modified 2 years, 11 months ago by ProtonsTalk.

July 19, 2021 at 9:18 pm in reply to: State one advantage of a light microscope over an electron microscope. #10387::**Electron microscopes**have two key advantages when compared to light microscopes:- They have a much higher range of
**magnification**(can detect smaller structures). - They have a much higher
**resolution**(can provide clearer and more detailed images).

- This reply was modified 2 years, 11 months ago by ProtonsTalk.
- This reply was modified 2 years, 11 months ago by ProtonsTalk.

July 19, 2021 at 10:06 pm in reply to: Which equation represents a line that passes through (4, 1/3) and has a slope of 3/4? #10407::**Answer:**

Equation of a line

=> y – y1 = m(x-x1)

=> y-1/3 = 3/4(x-4)Therefore the correct option is

**(b) y-1/3 = 3/4(x-4)**- This reply was modified 2 years, 11 months ago by ProtonsTalk.
- This reply was modified 2 years, 11 months ago by ProtonsTalk.

July 19, 2021 at 1:15 pm in reply to: If f(x) = 3x^2+1 and g(x) = 1 – x, what is the value of (f – g)(2)? #9911July 19, 2021 at 2:37 pm in reply to: Which classification best represents a triangle with side lengths 10 in., 12 in., and 15 in.? #9995July 19, 2021 at 6:41 pm in reply to: The scientific process is ________, involving both inductive and deductive reasoning #10210 - AuthorPosts