Test 1 Tip En Clasa A VIII-a

The given calculation is 25-25 divided by 5. When we subtract 25 from 25, we get 0. And when we divide 0 by 5, the result is still 0. Therefore, the answer to the calculation is 0.

The question asks for 20% of 25, which can be calculated by multiplying 25 by 20% (or 0.20). The result is 5, so 20% of 25 is equal to 5.

The geometric mean of two numbers is the square root of their product. In this case, the product of 12 and 27 is 324. Taking the square root of 324 gives us 18, which is the geometric mean of the two numbers.

The question is asking for the area of a square with a perimeter of 12 cm. To find the area, we need to divide the perimeter by 4 to find the length of each side of the square. In this case, 12 cm divided by 4 equals 3 cm. Since the length of each side is 3 cm, we can calculate the area by multiplying the length of one side by itself, which gives us 3 cm multiplied by 3 cm equals 9 cm squared. Therefore, the area of the square is 9 cm squared.

The question asks for the sum of the lengths of the edges of a regular tetrahedron with an edge length of 8 cm. A regular tetrahedron has 4 equilateral triangles as its faces, so each edge length is the same. Since there are 6 edges in total, the sum of their lengths is 6 times the length of one edge, which is 6 * 8 cm = 48 cm.

The given question states that Ana has the following grades: 8, 9, and 10. The question asks for the average semester grade. To find the average, we add up all the grades and divide by the total number of grades. In this case, the sum of the grades is 8 + 9 + 10 = 27. Since there are three grades, we divide 27 by 3, resulting in an average of 9. Therefore, the correct answer is 9.

The correct answer is 144. This suggests that the area of the garden from the previous problem is equal to 144 square meters.

The length of the rectangular garden is given as 24 m. The width is stated to be equal to one-fourth of the length, which means the width is 24/4 = 6 m. The perimeter of a rectangle is calculated by adding the lengths of all its sides. In this case, the perimeter would be 2 times the length plus 2 times the width, which is (2*24) + (2*6) = 48 + 12 = 60 m. Therefore, the correct answer is 60.

The statement is true because it states that in each box, there is a capacity of 648 cubic centimeters of powdered milk.

By substituting the values of -2 and 2 into the function f(x) = 2x - 1, we can calculate f(-2) = 2(-2) - 1 = -4 - 1 = -5 and f(2) = 2(2) - 1 = 4 - 1 = 3. Adding these values together, -5 + 3 = -2. Therefore, the correct answer is -2.

The correct answer is (2x-3)/(2x+5). After simplifying the expression, we can see that the numerator remains the same, i.e., 2x-3, while the denominator changes to 2x+5. So, the correct answer is (2x-3)/(2x+5).

The explanation for the given correct answer is not available.

In the garden, tomatoes are cultivated and 25 kg are harvested from each square meter. These tomatoes are sold at the market for 4 lei per kilogram. To find the total amount earned, we need to multiply the amount of tomatoes harvested per square meter (25 kg) by the price per kilogram (4 lei). Therefore, the total amount earned is 25 kg * 4 lei/kg = 100 lei per square meter. Since the question does not specify the size of the garden, we cannot calculate the exact total amount earned. Therefore, the answer cannot be determined from the given information.

The lateral surface area of a regular quadrilateral pyramid can be calculated using the formula A = (perimeter of base) * (slant height) / 2. In this case, the perimeter of the base is 4 * 18 = 72 cm and the slant height is 15 cm. Plugging these values into the formula, we get A = (72 * 15) / 2 = 1080 / 2 = 540 cm². However, since the question asks for the area in square centimeters, the answer should be rounded to the nearest whole number, which is 540. Therefore, the correct answer is 540, not 432.

The question states that Alex read a book in three days. On the first day, he read one-third of the total number of pages. On the second day, he read half of the number of pages he read on the first day. Finally, on the third day, he read the remaining 150 pages. By adding up the pages read on each day, we can determine the total number of pages in the book. Therefore, the correct answer is 300.

To make 100 boxes, 7.56 square meters of cardboard are needed.

The correct answer is 495 because when we calculate the sum of the multiples of two digits of the number 11 (which are 11 and 22), we get 33. However, none of the given options have a sum of 33. Therefore, the correct answer must be a typo or an error in the question.

The area of the triangle determined by the graph with the xoy coordinate system is equal to 1/4.