1.what is 10+20% ?
2.what is 10-20% ?

The question can be misunderstood

10 + 20% = 10 + 20/100 = 10 + 0.2 = 10.2

But if the question is what is 10 increased by 20% it is

10 * (1 + 20%) = 10 * (1 + 0.2) = 10 * 1.2 = 12

So that is different.

Else with the other question

10 - 20% = 10 - 20/100 = 10 - 0.2 = 9.8

10 * (1 - 20%) = 10 * (1 - 0.2) = 10 * 0.8 = 8

10 - 20% = 10 - 20/100 = 10 - 0.2 = 9.8

10 * (1 - 20%) = 10 * (1 - 0.2) = 10 * 0.8 = 8

Step-by-step explanation:

answer:

(-8,7)

explanation:

we know that  

f

(

−

3

)

=

7

therefore, if we wish to get the output as 7, in the function, we need to have our input to be -3.

looking at the function  

f

(

x

+

5

)

, what should the value of x be, such that the input in the function becomes 7?

we simply equate the terms,

x

+

5

=

−

3

x

=

−

8

thus, the point on the new function would be  

(

−

8

,

7

)