Write an equation to represent the
relationship "a number decreased by
11 is equal to -18." then solve the
equation

x-11=-18

x=-7

Check work:

-7 -11 = -18

When both numbers are negative, you add them.

-7 "plus" -11 equals -18.

The equation to represent the  relationship "a number decreased by  11 is equal to -18 is  x - 11 = -18. The value of x is -7

Solution:

From the question:

Given:

A number decreased by 11 is equal to -18.

That would be written as:

To Find the Number:

Assume the variable be X in its place

x - 11 = -18 (1)

Whenever it says "decreased by" a number, you know you are subtracting that number

Therefore from equation (1)

Now, to solve x - 11 = -18  

x - 11 = -18  

x=-18 + 11

x = -7

Hence the value of x is -7  Hence the equation to represent the relationship is x - 11 = -18

4

step-by-step explanation:

(a) the volume of the cone is 20/3 in3

hence, option a is correct.