Soos is spending money at the average rate of $5 per day. After 9 days, he has $25 left. How much money did Soos have at the beginning (on day 0)?

 She had $70 at the beginning.

Step-by-step explanation:

Lets represent this situation as an equation where we will  use y to represent the amount of money left and x for the number of days.  

Using the formula  y = mx + b  , we can say b  will be the amount in 0 days because its the y intercept and the y intercept is when x is 0.  

m will be the rate of change and the rate of change will be -5 per day because he is spending.

In 9 days, he had $25 left  and we can also represent that by the point (9,25)  

Now input the values for x and y into the formula with the slope and solve for b.

y = mx + b

25 = -5(9) + b

25 =  - 45 + b    

+45    +45

 b = 70  

This means she started with $70.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer