Explanation

"Cut" is an irregular verb because its past tense and past participle forms are the same: cut – cut – cut.

Laugh, shout, paint are regular verbs that follow the pattern of adding -ed in past tense.

Explanation

Present Continuous Tense:

Structure:

Subject + is/am/are + verb(-ing)

→ Describes an action happening right now.

He is writing an essay. → Present continuous

Explanation

Let's solve the equation:

2(x - 2) - 5(x - 5) = 4(x - 8) - 2(x - 2)

Expanding both sides:

2x - 4 - 5x + 25 = 4x - 32 - 2x + 4

Combine like terms:

-3x + 21 = 2x - 28

Add 3x to both sides:

21 = 5x - 28

Add 28 to both sides:

49 = 5x

Divide by 5:

x = 49/5

Explanation

The average is calculated by dividing the sum of quantities by the number of quantities. Therefore, the number of quantities can be found by dividing the sum by the average.

Number of quantities = Sum / Average

Number of quantities = 5200 / 650

Number of quantities = 8

Explanation

Step 1: Calculate the perimeter of the square ground.

The perimeter of a square is given by P = 4 × side length. Here, the side length is 20 meters.

P = 4 × 20 = 80 meters

Step 2: Calculate the total distance covered in 5 rounds.

Total distance = Number of rounds × Perimeter

Total distance = 5 × 80 = 400 meters

Explanation

To evaluate the expression 1/2 + 1/3 - 1/4, we need to find a common denominator. The least common multiple of 2, 3, and 4 is 12.

1/2 = 6/12

1/3 = 4/12

1/4 = 3/12

Now, let's add and subtract:

6/12 + 4/12 - 3/12

= (6 + 4 - 3)/12

= 7/12

Explanation

To find the greatest number of kits they can make, we need to determine the greatest common divisor (GCD) of the quantities of each type of bandage: 30, 60, and 75.

The prime factorization of each number is:

30 = 2 × 3 × 5

60 = 2² × 3 × 5

75 = 3 × 5²

The common factors are 3 and 5, so the GCD is 3 × 5 = 15.

Thus, they can make 15 kits.

Explanation

A cone has one curved edge, where the circular base meets the curved surface.

It has 1 face (curved) + 1 base and 1 vertex, but only one edge (not straight).

Explanation

A composite number is a positive integer that has at least one positive divisor other than 1 and itself.

Let's examine the numbers:

4: divisors are 1, 2, and 4 (composite)

9: divisors are 1, 3, and 9 (composite)

15: divisors are 1, 3, 5, and 15 (composite)

Since all numbers (4, 9, 15) have divisors other than 1 and themselves, they are composite numbers.

The group 4, 9, 15 consists entirely of composite numbers.

Explanation

A number divisible by both 2 and 5 is automatically divisible by their LCM = 10.

For example, 20 ÷ 2 = 10, 20 ÷ 5 = 4, and 20 ÷ 10 = 2.