Question

tell me this one......​

Answer 1

Answer:

A cylindrical tube opened at both the ends is made of iron sheet which is 2cm thick. If

the outer diameter is 16cm and its length is 100cm, find how many cubic centimetres

of iron has been used in making the tube.

Answer 2

★ Given:

The expressions -2x² + xy, 5x² + 2xy and 4x² - 7xy

★ To Find:

The sum of all the expressions.

★ Solution:

$\sf{-2x^2+xy+5x^2+2xy+4x^2}$

Here, we can rearrange the like terms together:

$\sf{-2x^2+4x^2+5x^2+xy-7xy+2xy}$

Now applying the required operations on the like terms:

$\sf{7x^2-4xy}$

We can't apply anymore operations as the terms are unlike.

So the final answer is:

7x² - 4xy

Knowledge Bytes:

→ Terms

A term can be a single positive/negative number, a variable of a combination of these connected without any mathematical operations.

Eg. 5xy

→ Expressions

An expression is combination of constants and variables connected by mathematical operations.

Eg. 7x + 8y

→ Algebraic Equation

An algebraic equation contains terms and expressions connected by an equal sign.

Eg. 4xy + 9xy = 13xy