-9 + 10 over 4 = -7
1/4 = -7
1/4 does not equal -7
Answer:
125,000 * 1.0625^t years
Step-by-step explanation:
compound interest = increase in amount
100 + 6.25 = 106.25
106.25/100 = 1.0625
therefore, 125,000 * 1.0625^years
Answer:
The height of the lighthouse is 
Step-by-step explanation:
Let
h -----> the height of the lighthouse
we know that
The tangent of angle of 68 degrees is equal to divide the height of the lighthouse by the horizontal distance from the buoy to the base of lighthouse
so

Solve for h

Answer:
6 days
Step-by-step explanation:
pay 60 = -60
Let d = the number of days
30d - 60 = sister
20d = me
Equation:
30d - 60 = 20d Move 30 to the other side
-30d -30d
-60 = 20d - 30d Combine liked terms
-60 = -10d
-10 -10 Divide
d = 6