Answer:
(x+6)=3
Step-by-step explanation:
-3
FV = PV ( 1 + i ) ^t
FV = $400, PV = $220, i = 3% = 0.03
400 = 220 * ( 1 + 0.03 ) ^t
( 1 + 0.03 ) ^t = 400 : 220 = 1.818181
t = log ( 1.03 ) 1.81818
t = 20
After 20 years his investment will reach at least $400.
Answer:
x = 60
Step-by-step explanation:
The sum of the angles in a triangle is 180
40 + x+20 + x = 180
Combine like terms
2x+60 =180
Subtract 60 from each side
2x+60-60 =180-60
2x =120
Divide by 2
2x/2 =120/2
x = 60
Alright, since 7% is 0.07 (put 2 decimal places in front of the percentage to get the decimal), we know that 0.07*the loan amount of the 7% loan=0.08*the loan amount of the 8% loan+250. If the 7% loan is x and the 0.08 loan is y, we have 0.07*x=0.08*y+250. We also know that x+y=25000, so if we subtract y from both sides of the equation we have 25000-y=x. Plugging that into 0.07*x=0.08*y+250, we get 0.07*(25000-y)=0.08*y+250
=1750-0.07y=0.08y+250. Multiplying both sides by 100 (to get integers), we get 175000-7y=8y+25000. Adding 7y to both sides, as well as subtracting 25000 from both sides, we get 150000=15y and by dividing by 15 we get
y=10000= the 8% loan amount. Since 25000-y=x,
25000-10000=15000=the 7% loan amount