To add 3/4 and 2/5, find a common denominator, which is 20. Convert: 3/4 = 15/20 and 2/5 = 8/20. So, 15/20 + 8/20 = 23/20.

The first 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29. Their sum is 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 = 129.

The sum of the interior angles of a quadrilateral is always 360 degrees.

Surface area = 6 × side² = 6 × (3)² = 54 cm².

Surface Area = 6 * side² = 6 * 4² = 96 cm².

Accommodation is the ability of the eye to adjust focus on near and far objects.

Ex ovo refers to the development of an embryo outside the female body.

The minimum temperature required to ignite a substance is called the Ignition Temperature.

Fertilization is the process by which a sperm fertilizes an egg.

The total number of edges is half the sum of the degrees. Here, (3+3+2+2+2)/2 = 6.

Products A and B combined represent 60% of the total sales in the pie chart.

The total sales for Product A in Q1 is $1000 and in Q2 is $2000. Combined, they total $3000.

Surface area of a sphere = 4πr² = 4π(7)² = 196 cm².

Sound intensity is measured in decibels (dB).

The SI unit of pressure is the Pascal (Pa), which is defined as one newton per square meter.

Using the property (a^m)^n = a^(m*n), we get 2^(3*2) = 2^6.

Using the property a^m * a^n = a^(m+n), we get 5^(2+3) = 5^5.

Substituting x = 4 gives (4 + 3)(4 - 2) = 7 * 2 = 14.

2^3 = 8 and 3^2 = 9. Therefore, 2^3 + 3^2 = 8 + 9 = 17.

2^5 = 2 * 2 * 2 * 2 * 2 = 32.

3 cubed is 27 and 2 cubed is 8. So, 27 + 8 = 35.

Substituting x = 3 gives 4(3^2) - 16 = 4(9) - 16 = 36 - 16 = 20.

Calculating gives 5(2) - 3(1) = 10 - 3 = 7.

5^0 = 1, 5^1 = 5, 5^2 = 25. So, 1 + 5 + 25 = 31.

According to the order of operations, we first multiply 5 by 2 to get 10, then add 7 to get 17.

7 × 8 = 56; 12 ÷ 4 = 3; 56 + 3 = 59.

Using the property a^m * a^n = a^(m+n), we get 7^(2+3) = 7^5.

9^(1/2) is the square root of 9, which is 3.

Using the difference of squares: 9² - 5² = (9 - 5)(9 + 5) = 4 × 14 = 56.

Subtract 8 from both sides: -2x = -4. Divide by -2: x = 2.