The climate of a place is predicted with the help of weather reports collected in the past-Ans- Option (d) 25 years at least.

Solution: a)$(x - \frac{1}{x} )^{2} = x^{2} + \frac{1}{x}^{2} - 2 \times x \times \frac{1}{x}$ = $x^{2} + \frac{1}{x}^{2} - 2 $= $3 - 2$ = 1 So ,$(x - \frac{1}{x} ) $= 1 or -1 (b)$(x + \frac{1}{x} )^{2} = x^{2} + \frac{1}{x}^{2} + 2 \times x \times \frac{1}{x}$ = $x^{2} + \frac{1}{x}^{2} + 2 $= 3 + 2 = 5 So ($x + \frac{1}{x}$ ) = √5√5√5 or -√5

Given $(x^{2} + y^{2})$ = 74; xy = 35 To find: a) $x+y$b)$x-y$Solution:a)$(x + y ) ^ {2} = x^{2} + y^{2} + 2xy$= $74 + 2(35)$= $74 + 70 = 144$So $x + y$ = 12 or -12 b) $(x - y ) ^ {2} = x^{2} + y^{2} - 2xy$ = $74 - 2(35) = 74 - 70 = 44$ $x - y$ = 2 or -2

Our primary sources of food are plants and secondary animals. We get most of our food from plants & animals. Thus there are two kinds of food, 1. Plant-based food, From plants, we get food from different parts such as roots, leaves, stems, flowers, and fruits.  For example-  vegetables, ... Read More

Light gets reflected or Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. Diffuse reflection is when light hits an object and reflects in lots of ... Read More

Aloe vera is a herbaceous plant or herb (like flowers or grass).It is a succulent plant species of the genus Aloe. Succulents are those plants that store water in their leaves, that are typically thicker than other plants.

Silk is a natural fiber that is made by the silkworm ‘Cocoon’. As it’s a strong fiber, it is mainly used in the textile industry. The production of silk and rearing of silkworms is called sericulture.It is known as ‘Resham’ in the northern part of India, and ‘Pattu’ in southern ... Read More

Sorting of objects into groups with each group having its own characteristic properties is called Classification of Objects.We classify objects because it gives us the following advantages:1. Classification of objects makes it easier to locate and identify with them.2. We can get an idea of the properties of other members ... Read More

Given:  $\frac{3+√5}{3-√5}$To do: Rationalize the given numberSolution:$\frac{3+√5}{3-√5}$ [Multiply and divide by $3+\sqrt{5}$]=$\frac{3+√5}{3-√5}  \times  \frac{3+√5}{3+√5}$  Numerator- $(a+b)(a+b)=(a+b)^2$Denominator- $(a-b)(a+b)=a^2-b^2$=$\frac{(3+√5)^{2}}{3^{2}-√5^{2}}$ = $\frac{3^{2} + 2 \times 3 \times  √5 + (√5)^2} {9 - 5}$ = $\frac{9 +6√5 + 5}{4}$ = $\frac{14 + 6√5}{4} $ = $\frac{7+3√5}{2}$ Ans

Mitochondria are double membrane-bound cell organelles found in most eukaryotic organisms with a typical size of 0.75-3 μm². They are commonly referred to as the ‘powerhouse of the cell’, as they produce the energy necessary for the cell's survival and functioning. The amount of mitochondria in a cell depends on how much ... Read More