Question

In 2015, there were 759 laptops at lightning high school. Starting in 2016, the school bought 75 more laptops at the end of each year. The function T(x)=75x+759 can be used to determine the total number of laptops at the school x year after 2015. What is the project total number of laptops at Lightning High School at the end of 2020?

Answer 1

the total number of laptops ar lightning school at the end of 2020 is 1134

Explanation

Step 1

Let

x represents the year after 2015=2020-2015=

x=5

In 2015, there were 759 laptop, Starting in 2016, the school bought 75 more laptops at the end of each year,it is

$\begin{gathered} T(x)=75x+759 \\ \end{gathered}$

let's check

in 2015

$\begin{gathered} x=0 \\ T(0)=75\cdot0+759 \\ T(0)=759 \end{gathered}$

Step 2

now, we need the total for 2020

$\begin{gathered} x=\text{ number of years after 2015} \\ x=2020-2015=5 \\ \text{replace} \\ T(x)=75\cdot x+759 \\ T(5)=75\cdot5+759 \\ T(5)=375+759 \\ T(5)=1134 \end{gathered}$

Hence, the total number of laptops ar lightning school at the end of 2020 is 1134