3) Write an expression to represent:

"8 times the sum of 10,

and a number"

8 x 10 + x

X meaning the unknown variable, representing a number. Your welcome!

Step-by-step explanation:

Given the information

8 times the sum of 10 and a number

Let the number be x

Then, the sum of the number and 10 will give (x+10)

Then, 8 times the sum of 10 and the number will give

8 * (x+10)

8 (x+10)

Open the bracket

8x+80

Then, the expression is 8x+80