Correct Answer: C. 10.6ms^-1

Explanation

n = \(\frac{\sin 45}{\sin 30} = 1.4142\)

n = \(\frac{15m/s}{x}\)

x = \(\frac{15}{1.4142}\) = 10.6m/s

Correct Answer: B) important

Explanation

The most logical and precise choice to complete the text would be B) important. Benito Juarez's accomplishments and his role as Mexico's first president from an Indigenous community make him a significant figure in the country's history.

Correct Answer: C. 3/4

Explanation

(a)Bull:

(i) This is a speculator on the stock exchange.

(ii) He buy shares on the stock exchange in the expectation that the price will rise preferably before. The end of the account so that he can sell at a higher price to make profit.

(b) Bear:

(i) This is a speculator on the stock exchange.

(ii) He sells shares he does not have at a high price today with the hope that the price will fall before he had to deliver the shares, he will then buy the shares for delivery to make profit.

(c) Option:

(I) This is a chance to buy or sell a share at an agreed price and at an agreed future time.

(ii) Options are particularly useful at times of uncertainty.

(iii) An option to buy is know as a call option while the option to sell is known as put option.

(d) Backwardation:

(i) This is a penalty paid to a stock broker by a seller of shares who fails to deliver on the agreed date.

(ii) The transaction is fore closed and the price differential is debited to the sellers account

(e) Contango:

(i) This is a stock exchange term meaning postponement of payment until the next account.

(ii) It is also used to signify the extra charge paid by buyer of security for delaying payment.

(iii) The day of payment is called contango day.

Correct Answer: D) (ii) and (iii) only

Explanation

In order to determine which of the given reactions are redox reactions, we need to identify if there is a transfer of electrons between species in each reaction, meaning that one species is reduced (gains electrons) while another is oxidized (loses electrons).

Let's analyze each reaction:

(i) LiOH + CO\(_2\) \(\rightarrow\) Li\(_2\)CO\(_3\) + H\(_2\)O: In this reaction, lithium (Li) in LiOH does not change its oxidation state, and neither does carbon (C) in CO\(_2\). Therefore, this reaction is not a redox reaction.

(ii) 2H\(_2\) + O\(_2\) \(\rightarrow\) 2H\(_2\)O: In this reaction, hydrogen (H) goes from an oxidation state of 0 in H\(_2\) to +1 in H\(_2\)O, while oxygen (O) goes from an oxidation state of 0 in O\(_2\) to -2 in H\(_2\)O. This means that hydrogen is oxidized, and oxygen is reduced, so this reaction is a redox reaction.

(iii) 2Cu + O\(_2\) \(\rightarrow\) 2CuO: In this reaction, copper (Cu) goes from an oxidation state of 0 in Cu to +2 in CuO, while oxygen goes from an oxidation state of 0 in O\(_2\) to -2 in CuO. This means that copper is oxidized, and oxygen is reduced, so this reaction is a redox reaction.

(iv) HCl + AgNO\(_3\) \(\rightarrow\) AgCl + HNO\(_3\): In this reaction, hydrogen (H) and chlorine (Cl) in HCl exchange places with silver (Ag) and nitrate (NO\(_3\) in AgNO\(_3\), but their oxidation states do not change. This is an example of a metathesis reaction, not a redox reaction.

Based on the analysis, the correct answer isOption D, as only reactions (ii) and (iii) are redox reactions.

Correct Answer: D. chisel - like front teeth

Correct Answer: C. sex and civic education.

Correct Answer: A. who

Correct Answer: A. the xylem is more interiorly located than the phloem

Correct Answer: A. cutlet