Charles is saving $5 each week. he earns an extra $15 by mowing his neighbors lawn. how many weeks does he need to save in order to get $75

Hey there!!

Given amount of information:

With this given information, we get to know that the number 15 is a constant and we don't know the number of weeks. Hence, it is a variable.

Let's take the number of weeks as 'w'

Let's now form a equation.

... 5w + 15 = ?

The total amount we want is $75. Hence,

... 5w + 15 = 75

... 5w + 15 - 15 = 75 - 15

... 5w = 60

... 5w/5 = 60/5

... w = 12

Hence, the number of weeks is 12.

step-by-step explanation:

i have no idea

geometric series converge the common ratio r has magnitude less than one.

which is equivalent to

for the example we need

|2-x| < 1

-1 < 2-x   and 2-x < 1

x < 3 and x > 1

we can write that

answer: 1 < x < 3

1a. common ratio r=250/25=10 > 1     diverges

1b.   r=50/100=1/2 converges

when these converge they converge to

where a is the first term.

answer: 200

1c. r=-1   so it's not the case that |r| < 1.     diverges

2a. x is the common ratio so we converge when |x|< 1

2b.   r=-10x / -2 = 5x.

we converge when

|5x| < 1

|x| < 1/5

2c.   r=3-2x

-1 < 3-2x and 3-2x < 1

-4 < -2x and 2 < 2x

x < 2 and 1 < x

1 < x < 2

2d. [/tex] r=-48x^3/12 = 4x^3[/tex]

|4x^3| < 1

|x^3| < \frac 1 4

|x| < 4^{-1/3}