Correct Answer: D. alkanal

Correct Answer: A. recognised the supreme power of Jesus

Correct Answer: B. 90cm²

Explanation

V = L x B x H

V = \(2x \times x \times x = 2x^3\)

= 54cm3

i.e. 2x3 = 54

x3 = \(\frac{54}{2}\) = 27

x = 3\(\sqrt{27}\)

x = 3

L = 2x i.e. 2 x 3 = 6cm

B = x i.e. x = 3cm

H = x i.e. x = 3cm

but A = 2(LB + LH + BH) = 2(6 x 3) + (6 x 3) + (3 x 3) = 2(18 + 18 + 9) = 2(45)

= 90cm²

Correct Answer: B. carry out the nude act

Correct Answer: D. Producers and consumers

Correct Answer: C. 99 years

Correct Answer: C. increase in atmospheric temperature

Correct Answer: A. 35.75m

Explanation

\(\tan 40° = \frac{30}{|PQ|}\)

\(|PQ| = \frac{30}{\tan 40°} = \frac{30}{0.839}\)

= 35.75m

Correct Answer: B. 1:40,000

Correct Answer: C. there were

Explanation

The sentence is reporting what they said. When reporting speech, if the main verb (said) is in the past tense, the verb in the reported clause often shifts to a past tense as well (unless it's a timeless truth or a future event that is still future from the perspective of the reporting verb).

We need a phrase that introduces the existence or presence of a number of candidates. The common construction for this is there is/are (present) or there was/were (past).

Let's analyze the options:

• A. they were: They were about 20 candidates... This doesn't make sense. They would refer to the candidates themselves, implying the candidates *were* the number 20, which is grammatically incorrect for expressing the *number* of candidates.

• B. it will be: They said that it will be about 20 candidates... While will be refers to the future, it will be 20 candidates is not the natural way to express the existence of candidates. Also, the main clause is past tense, making a direct future tense here less likely unless the context explicitly refers to a future event *from the past perspective*.

• C. there were: They said that there were about 20 candidates... This is grammatically correct and idiomatic. There were introduces the existence of multiple items/people in the past. Since they said is past, there were fits perfectly for a past situation.

• D. it was: They said that it was about 20 candidates... Similar to it will be, it was 20 candidates is not the standard way to express the existence of a number of candidates. It was is typically used to identify something (It was John) or as a dummy subject for time/weather, not to state the simple existence of a number of items where there were is preferred.

The most natural and grammatically correct option to express the existence of 20 candidates in the past, reported by someone in the past, is there were.

The final answer is C