Variable

Q.

Is differentiate the same as derivative?

Q. In algebra, a symbol, the value of which is unknown is called a ________.

1. Power
2. Constant
3. Variable
4. Degree

Q.

In subtraction problem, the greater number from which another number is subtracted is called$\_\_\_\_\_\_\_\_$

Q.

Why is a function important?

Q.

Write the expressions for the following statements.

$x$ subtracted from $2$ times $y$

Q. Which of the following can be used as a variable?

1. 5
2. $\pi$
3. a
4. $\frac{13}{5}$

Q.

'Number of seconds in one minute' is a variable.

1. False

2. True

Q.

A combination of a variable and a constant is a variable.

1. False

2. True

Q. The value of the variable which satisfies the equation is called _________ of the equation.

1. the solution
   
2. a real solution
   
3. a rational solution
   
4. the value
   

Q.

The expression $13+90$ is a ________.

Q.

The total number of planets around the Sun can be denoted by the variable n.

Q.

In the expression $2\pi r$, the algebraic variable is ________.

Q.

The algebraic expression "5x+2” does not contain any constant term.

1. True

2. False

Q.

The algebraic expression "x” does not contain any constant term.

1. True

2. False

Q. What is a variable?

1. A symbol to represent an unknown quantity in an expression
2. A constant
3. An operator
4. A mathematical statement

Q.

Question 2

In which of the following expressions only numbers are used:

(a) y + 3

(b) $(7\times 20)-8z$

(c) $5(21-7)+7\times 2$

(d) 5

(e) 3x

(f) 5-5n

(g) $(7\times 20)-(5\times 10)-45+p$

Q.

Write the expressions for the following statements.

$2$ times $y$ added to $3$

Q. The perimeter of a square is expressed as $4\times S$, where $S$ is a/an .

1. constant
2. variable
3. expression
4. term

Q.

Express the statement as an algebraic expression.

$x$divided by $5$ and subtracted from $y$ multiplied by $2$

Q.

Question 21

Fill in the blanks to make the statement true.

In the expression $2\pi r$, the algebraic variable is___.

Q.

Question 55

Answer True/False.

The number of lines that can be drawn through a point is a variable.

Q.

Write the following sets in rule method.

L = {summer season, rainy season, winter season}

Q. A ___ is a symbol, such as x, used to describe any number.

Q.

Write the constant term in the following expression :

$3x+y$

Q.

Ramesh recalled about the North Star and questioned Tina and Rina that which part of algebraic expression exhibits similar characteristics of a North Star. The answer is _______.

1. constant

2. variable

3. prime

4. none of the above

Q.

The quotient of $a$and $3$ less than twice of $a$ is-

1. $\frac{a}{a-3}$

2. $\frac{a}{2(a-3)}$

3. $\frac{a}{2a-3}$

4. $\frac{a-3}{2a}$

Q. 5 is a variable.

1. False
2. True

Q.

In algebra letters may stand for

1. known quantities

2. unknown quantities

3. fixed numbers

4. none of these

Q.

Classify the following into algebraic expressions and arithmetic expression$.$ Also identify the constant and variable terms in each expression$.$

$5-16y$

Q.

State whether the following statements are true (T) or false (F):

(i) If $x$ is a variable then $5x$ is also variable.

1. True
2. False