Which expression is equivalent to −10 + (−40) + (−90)?

10 + 40 + 90
−10 + (−90) + (−40)
−10 − (40 − 90)
−(10 − 40) + (−90)

 The correct option is

(B) −10 + (−90) + (−40)

Step-by-step explanation:  We are given to select the expression that is equivalent to the following expression :

First, we will evaluate the value of expression (i) as follows :

Now, we will evaluate the values of the optional expressions one by one.

Option (A) :

We have

So, this option is NOT correct.

Option (B) :

We have

So, this option is CORRECT.

Option (C) :

We have

So, this option is NOT correct.

Option (D) :

We have

So, this option is NOT correct.

Thus, the correct option is

(B) −10 + (−90) + (−40)

cbnygjdyj

step-by-step explanation:

let's add {f(x)=x+1}f(x)=x+1 and {g(x)=2x}g(x)=2x together to make a new function.

f(x)+g(x) =(x+1)+(2x)=x+1+2x=3x+1

let's call this new function hh. so we have:

{h(x)}={f(x)}+{g(x)}{=3x+1}h(x)=f(x)+g(x)=3x+1

we can also evaluate combined functions for particular inputs. let's evaluate function hh above for x=2x=2. below are two ways of doing this.

method 1: substitute x=2x=2 into the combined function hh.

h(x)

h(2)

​    

=3x+1

=3(2)+1

=7

​ since h(x)=f(x)+g(x)h(x)=f(x)+g(x), we can also find h(2)h(2) by finding f(2) +g(2)f(2)+g(2).

first, let's find f(2)f(2):

f(x)

f(2)

​    

=x+1

=2+1

=3

​  

now, let's find g(2)g(2):

g(x)

g(2)

​    

=2x

=2⋅2

=4

​  

so f(2)+g(2)=3+4=\greend7f(2)+g(2)=3+4=7.

notice that substituting x =2x=2 directly into function hh and finding f(2) + g(2)f(2)+g(2) gave us the same answer!