The answer for number one is -3.938.
For full answer it is found on:
https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1029380.html
Answer:
5
Step-by-step explanation:
keep, change, flip
2/1 (keep) x (change to multiply) 5/2(2/5 flips to 5/2)
2/1 x 5/2
10/2
5
Y *x =20
y +x =9
rewrite 1st eq. as y = 20/x
subsituute that into 2nd eq.
20/x +x =9
multiply each term by X
20 +x^2 = 9x
subtract 9x from each side:
x^2 - 9x +20 = 0
now factor:
(x-5) (x-4) = 0
solve for x
5-5 = 0
4-4 = 0
so X can be 4 or 5
replace x into equations and solve for Y
so when X = 4, Y = 5
When X = 5, Y = 4
x= 5,4
y = 4,5
You can calculate the arc lenght by using this formula:
arc length = 2π*r*(A/360) , where A=angle of the arc.
So for you it would be:
arc length = 2π*4*(72/360) = 5.03
I hope that helped.
