You start with 80 and ADD 10 each week
----> 80 + 10x
Your brother starts with 275 and SUBTRACTS 15 each week
---> 275 - 15x
Set expressions equal to find out when you have same amount as your brother.
80 +10x = 275 -15x
Add 15x to both sides
80 +25x = 275
Subtract 80 from both sides
25x = 195
Divide by 25
x = 7.8 (Round up to 8)
This means in 8 weeks you will have caught up and if fact have more money than your brother.
Since you save 10 per week, in 8 weeks the Total saved = 10*8 = 80
Answer:
885735
Step-by-step explanation:
5
x 3
15
x 3
45
x 3
135
x 3
405
x 3
1215
x 3
3645
x 3
10935
x 3
32805
x 3
98415
x 3
295245
x 3
885735
Find what x is first. since it's a regular polygon all the sides are equal. so 3(x-1) = 5x-6. once you find x put it in one of the sides and multiply the length of the side by the amount of sides.
Since AK = KD, then the triangle ABD is isosceles,
Then BD = AB. Denote AB by x and AK by y.
Then,
2x+4y=24 (the perimeter)
cos 60=y/x.
From the second equation we get
Plug in the first equation we get:
We deduce that