Explanation

Step 1: Evaluate the expression inside the parentheses

0.3 + 0.3 = 0.6

Step 2: Multiply 2 by the result

2 × 0.6 = 1.2

Step 3: Multiply 1.2 by 2

1.2 × 2 = 2.4

Explanation

Step 1: Recall the definition of a^0

Any non-zero number raised to the power of 0 is 1.

Step 2: Evaluate the options

𝑎/𝑎 = 1 (since any number divided by itself is 1, assuming 𝑎 ≠ 0)

𝑎^1−1 = 𝑎^0 = 1

Step 3: Determine the best answer

All the given options (𝑎/𝑎, 1, 𝑎^1−1) represent the value of 𝑎^0 correctly, assuming 𝑎 ≠ 0.

Explanation

Step 1: Apply the formula (a - b)² = a² - 2ab + b²

(7 - 9)² = (7)² - 2(7)(9) + (9)²

Step 2: Compare with the given options

The correct expansion is (7)² - 2(7)(9) + (9)².

Explanation

Step 1: Calculate the square root of 9

√9 = 3

Step 2: Multiply 3 by the square root of 9

3 × 3 = 9

Explanation

Step 1: Substitute the values of a and b into the inequality

2 - a + 2 < b - 1

2 - 5 + 2 < 7 - 1

Step 2: Simplify both sides of the inequality

-1 < 6

Step 3: Determine the truth value of the inequality

Since -1 is less than 6, the inequality is true.

Explanation

Step 1: Follow the order of operations (PEMDAS/BODMAS)

First, calculate 6 × 4 × 0.5

Step 2: Calculate 6 × 4

6 × 4 = 24

Step 3: Multiply 24 by 0.5

24 × 0.5 = 12

Step 4: Add 2 to the result

2 + 12 = 14

Explanation

120 × 0.3 = 36

Explanation

0.8 ÷ 0.1 = 8

Explanation

0.2 × 0.02 = 0.004

Explanation

The backbone of DNA consists of alternating deoxyribose sugar and phosphate groups, linked by phosphodiester bonds.

Key Information:

Sugar-Phosphate Backbone:

• Provides structural stability to the DNA double helix.
• Directionality: 5’ (phosphate) to 3’ (sugar) orientation.

Nitrogenous Bases (A, T, C, G):

• Attached to the sugar but not part of the backbone.
• Form hydrogen bonds to create base pairs (A-T, C-G).