Answer:
![f(7)=-4](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5hlsbvc60l0gi47xky1o2gier5z460ya10.png)
Explanation:
1. You have the following function given in the problem:
![f(x)=10-2x](https://img.qammunity.org/2020/formulas/mathematics/middle-school/mwkdaqhob4vmf9xl8hohzcc9wp88e0h0nq.png)
2. Then, to find
asked in the exercise, you only need to substitute
(which is the input value) into the given function.
3. Therefore, keeping the above on mind, you obtain that
is:
![x=7](https://img.qammunity.org/2020/formulas/mathematics/high-school/5ymgceaqbtxby47vkmnw7y964ourmheca5.png)
![f(7)=10-2(7)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/vu2hfxuf48gg4k1fjr2fj4fsls9i5ymsrv.png)
![f(7)=10-14](https://img.qammunity.org/2020/formulas/mathematics/middle-school/zrviz1rysgsm1k7184xoqimq8cpp6omupl.png)
![f(7)=-4](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5hlsbvc60l0gi47xky1o2gier5z460ya10.png)