Explanation

4 + 4 - 4 + 4 = 8

Explanation

23*(83/7)= 272.7

Explanation

To solve this problem, we need to find the rate at which the mason lays bricks, and then multiply that rate by the number of hours he works.

Rate = Number of bricks / Time = 280 bricks / 4 hours = 70 bricks per hour

If he works for 9 hours, he will lay:

70 bricks/hour x 9 hours = 630 bricks

So, the correct answer is: 630

Explanation

• There are six zeros in Twenty Five Million.
• 25,000000

Explanation

6 + 6 = 12

12 + 9 = 21

21 + 12 = 33

33 + 15 = 48

Explanation

Explanation

If r₁ and r₂ are roots of a quadratic equation, then it can be written as:

$$(x - r₁)(x - r₂) = 0$$

Substituting r₁ = 2 and r₂ = -3:

$$(x - 2)(x + 3) = 0$$

Explanation

The formula to convert Celsius to Fahrenheit is (°C × 9/5) + 32.

For 1°C, the result is 33.8°F.

Explanation

To solve this, we need to follow the order of operations (PEMDAS):

Multiply 6 and 20: 6 × 20 = 120

Divide 120 by 4: 120 ÷ 4 = 30

Subtract 40 from 10: 10 - 40 = -30

Add 30 to -30: -30 + 30 = 0

Explanation

A mean in maths is the average of a data set, found by adding all numbers together and then dividing the sum of the numbers by the number of numbers.

For example, with the data set: 8, 9, 5, 6, 7, the mean is 7, as 8 + 9 + 5 + 6 + 7 = 35, 35/5 = 7.