Explanation

The correct phrasing requires "Was the microwave" to form a proper question about the invention of the microwave.

It follows the structure of asking about the invention of a specific item in the past.

Explanation

Epiphytes grow on large trees to access sunlight but do not harm the host tree or take nutrients from it.

This is an example of commensalism, where one organism benefits and the other is unaffected.

Explanation

Given:

∪ = {1, 2, 3, ..., 15}

A = {2, 4, 6, ..., 14}

B = {1, 3, 5, ..., 15}

A' = ∪ - A = {1, 3, 5, ..., 15} = B

B' = ∪ - B = {2, 4, 6, ..., 14} = A

A' ∪ B' = B ∪ A = ∪ (since B and A are complementary sets that together form ∪)

Explanation

"Lying" is the present participle of "lie" (to recline), used here as a continuous action.

The sentence describes people reclining on the sofa while watching TV, so "Lying" fits grammatically.

Explanation

Step 1: Find the prime factors of each number

255 = 3 × 5 × 17

345 = 3 × 5 × 23

495 = 3² × 5 × 11

Step 2: Identify the common factors

The common prime factors are 3 and 5.

Step 3: Calculate the HCF

HCF = 3 × 5 = 15

Explanation

To find the LCM, break down the numbers into their prime factors:

12 = 2² * 3

15 = 3 * 5

20 = 2² * 5

30 = 2 * 3 * 5

Step 1: Identify the highest powers of prime factors

The highest power of 2 is 2² (from 12 and 20).

The highest power of 3 is 3 (from 12, 15, and 30).

The highest power of 5 is 5 (from 15, 20, and 30).

Step 2: Calculate the LCM

LCM = 2² * 3 * 5

= 4 * 3 * 5

= 60

Explanation

An object floats if its density is less than the liquid's density.

An object sinks if its density is greater than the liquid's density.

Explanation

The sentence contains a main clause (“The people said”) and a subordinate clause (“as the horses advanced...”), which makes it complex.

Complex sentences have one independent clause and at least one dependent clause connected with conjunctions like “as,” “because,” or “since.”

Explanation

Variety in lesson planning helps keep students engaged and interested by incorporating different activities, methods, and resources.

It ensures that the learning experience remains dynamic and caters to diverse learning styles.

Explanation

An assessment is considered reliable if it produces consistent results when repeated under similar conditions.

Reliability ensures the stability and dependability of test outcomes.