Question

Write the following using algebraic notation, using the letter x for any unknown numbers:

a) I think of a number, multiply it by 2 and then subtract nine.
b)I think of a number, halve it and then subtract four.

Answer 1

Answer:

10/3

Step-by-step explanation:

2x-9=x/2-4

2x-x/2=-4+9

3x/2=5

x=10/3

Answer 2

The answer is (a) x * 2 - 9 and (b) x / 2 - 4

As per the question given,

a) I think of a number, multiply it by 2 and then subtract nine.

b)I think of a number, halve it and then subtract four.

Algebraic notation may refer to: In mathematics and computers, infix notation, the practice of representing a binary operator and operands with the operator between the two operands (as in "2 + 2") Algebraic notation (chess), the standard system for recording movement of pieces in a chess game.

a) Let x be the number you think of. The expression for the operation described would be:

x * 2 - 9

b) Let x be the number you think of. The expression for the operation described would be:

x / 2 - 4

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