Kadin wants to buy a laptop that costs $500. He has already saved $80. He decides to save $30 each week. What is the least number of weeks he should save for to achieve his goal?

14 weeks

Step-by-step explanation:

Given

Kadin wants to buy a laptop of

He already saved and started saving each week

Suppose he saves for weeks to get the laptop i.e.

So, he need to save for 14 weeks to buy the laptop

x-1

Step-by-step explanation:

(x-7)-(x-6) =

The - sign before 6 is turned into a + sign when the bracket is removed because the arithmetic operation before the bracket is - and two - makes the second - turn into a + (It's a rule I can't rlly explain it well but yea)

x-7-x+6 = x-1-x

-7+6 makes it a -1.

x-x-1 = x-x-1

To make the denominator of the two fractions the same, I multiplied the second fraction by 3 so that both denominators are 6.

x-x-1 = x-1

After making the denominator the same, I can directly do the equation for the numerators (5-3=2) and keep the denominator the same.

x-1 = x-1

Since 2/6 has a common factor which is 2, I can divide both the numerators and denominators so that the fraction can be simplified further into 1/3, its simplest form.