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d, 7, 1. rea cincange singhatentheb’, 2. The formula, distance = speed x time is written as D = SxT, by making use of the letter 'D' for distance, ‘S' for, any eran, , 6.The en betieen ener in Fareritand Cbs: C= $(F-22), , Here. the letter ‘C’ is used to denote the temperature in degrees in the Celsius scale and 'F is used to denote the, temperature in degrees in the Fahrenheit scale., 4. Formula for simple interest is:, , Prinidpal Rate of Interest Time, , Simple Interest, 100, , On, = PRXT, , , , , , Here, P, R and T stands for principal, rate of interest and time respectively., , Algebraic Expressions, , ‘As we know, an algebraic equation is a complete mathematical sentence that includes a sign of equality (or equal, , , , , , , , , , sign), , ‘An algebraic expression is not a mathematical sentence. It is a mathematical phrase because it does not have an, qual sion, , ‘Algebraic Expression ‘Algebraic Equation, , x+3on743 x+3=100,7+3=10, , Bkor 3x6 k= 180, 36218, , Bx(1+7) Or, 2047) 2x(l47)=16 Or, 2x(x47)=16, , , , , , , , , , ‘An expression is made up of terms, where these terms are separate values in an expression. They can be separated, bby operations. like plus and minus signs., There are three parts of most expressions which are as follow:, Terms, Terms, , ff, L\\, , Coetfiient \\ constant, , Variable, Variable: Its the unknown number x in the given expression above., , Coefficient: It is the number that is multiplied by the variable x. In the above expression, x is multiplied by 7. so 7, is the coefficient of x., ‘Constant: It isa fixed number that does not change. In the above expression, 2 is a constant,, , ‘* An expression like x + y’ indicates the sum of two numbers represented by x and y. It means any number x plus any, number y. For example. Ifx = 3 and y = 7 then x + y = 3 +7 = 10. Clearly, x represents 3 and y represents 7., , ‘+ The expression x - y indicates that the number represented by y is subtracted from the number represented by x,, For example, ix = 12 andy = 4,then x-y = 12-4=8, Where, x represents the number 12 and y represents the number 4., , ‘* The expression xv or xxv indicates that the number represented by x is multiplied by the number represented by, , wy Unacademy Learner App, , OG «= Installed, x &