Given :The given expression is $[-86 + (-42) ] + [ - 181 - (-63)]$.To do :We have to evaluate the given expression.Solution :We know that, $(+) \times (-) = (-)$$(-) \times (-) = +$$[-86 + (-42) ] + [ - 181 - (-63)] = [-86 - 42 ] + ... Read More

Sulphuric acid is also known as oil of vitriol.It is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with molecular formula H2SO4.It is a colourless, odourless, and viscous liquid that is soluble in water and is synthesized in reactions that are highly exothermic.Sulphuric acid is a strong ... Read More

Food is a source of fuel to our body which is used to perform physical and mental activities. The loss and wastage of food in the food supply chain causes a load on agriculture to produce more amount of food and lack of nutrition as well. Therefore we should avoid ... Read More

Lime water is basic in nature because of the presence of Calcium Hydroxide. As Calcium Hydroxide is a strong base and gives off two hydroxyl ions, so lime water becomes basic in nature.

Given :The given number is 81180.To do :We have to find the least number to be added to 81180 to make it a perfect square.Solution :To find the least number to be added to 81180 to make it a perfect square can be found out by using the long division ... Read More

Given :The given expression is $(3x+4)(2x-3)+(5x-4)(x+2)$.To do :We have to simplify the given expression.Solution :We know that, $(a+b)(c+d)=a(c+d)+b(c+d)$$(3x+4)(2x-3)+(5x-4)(x+2)= 3x(2x-3)+4(2x-3)+5x(x+2)-4(x+2)$                                        $= 6x^2 -9x + 8x -12 +5x^2+10x -4x-8$          ... Read More

Given :The given expression is $14y-8=13$To do :We have to find the value of y.Solution :$14y-8+8=13+8$$14y=21$$y=\frac{21}{14}$$y=\frac{3}{2}= 1.5$The value of y is 1.5.

Given :The given expression is $7x-9=16$.To do :We have to find the value of xSolution :$7x-9=16$$7x-9+9=16+9$$7x=25$$x=\frac{25}{7}$.The value of x is $\frac{25}{7}$.

An element is a pure substance, which is made up of only one kind of atoms. It cannot be further reduced to simpler substances by any physical or chemical methods. An atom is the smallest unit of an element.Elements are classified into metals, non-metals, metalloids and noble gases.

Mixed fractions:Fractions that have a whole number part and a proper fraction part are called mixed fractions.For example, 2frac{3}{5}In 253​, 2 is the whole number part and 3/5 is the proper fraction part .To convert a mixed fraction to an improper fraction, follow these steps: 1. Multiply the whole number ... Read More