The numbers -9 and -4 add up to -13 and multiply to get 36
I hope this helped :)
<span>The question is asking us to calculate the final cost of the item after the tax is applied. The price of item before the tax is: P = $40 and the tax rate as a percent is 8%. It means that r = 0.08. And the formula is: C = P * ( 1 + r ). Finally: C = $40 * ( 1 + 0.08 ) = $40 * 1.08 = $43.20. Answer: The final cost is $43.20. </span>
Answer:
![\boxed{ \bold{ \huge{ \boxed{ \sf{k = 53}}}}}](https://tex.z-dn.net/?f=%20%5Cboxed%7B%20%5Cbold%7B%20%5Chuge%7B%20%5Cboxed%7B%20%5Csf%7Bk%20%3D%2053%7D%7D%7D%7D%7D)
Step-by-step explanation:
![\bigstar{ \sf{ \: \: \frac{3 + k}{14} = 4}}](https://tex.z-dn.net/?f=%20%5Cbigstar%7B%20%5Csf%7B%20%20%20%5C%3A%20%20%5C%3A%20%5Cfrac%7B3%20%2B%20k%7D%7B14%7D%20%3D%204%7D%7D)
: Do cross multiplication
![\hookrightarrow{ \sf{3 + k = 4 \times 14}}](https://tex.z-dn.net/?f=%20%5Chookrightarrow%7B%20%5Csf%7B3%20%2B%20k%20%3D%204%20%5Ctimes%2014%7D%7D)
: Multiply the numbers : 4 and 14
![\hookrightarrow{ \sf{3 + k = 56}}](https://tex.z-dn.net/?f=%20%5Chookrightarrow%7B%20%5Csf%7B3%20%2B%20k%20%3D%2056%7D%7D)
Move 3 to right hand side and change it's sign
![\hookrightarrow{ \sf{k = 56 - 3}}](https://tex.z-dn.net/?f=%20%5Chookrightarrow%7B%20%5Csf%7Bk%20%3D%2056%20-%203%7D%7D)
Subtract 3 from 56
![\hookrightarrow{ \sf{k = 53}}](https://tex.z-dn.net/?f=%20%5Chookrightarrow%7B%20%5Csf%7Bk%20%3D%2053%7D%7D)
The value of k is 53
Hope I helped!
Best regards! :D
~TheAnimeGirl