Answer:
Step-by-step explanation:
1/7+1/13=1/t
multiply both sides by 7*13*t
13t+7t=7*13
21t=91
t=91/19
it will take 4 hours and 8 minutes
Answer:

Step-by-step explanation:
the general equation of a circle is

with (h,k) being the centre of the circle and r the radius
Well,
First solve the square root which is 7
Funny enough, this makes 7 * 7 = 49
So the answer is 49!
Hope I helped!
Answer:
$86.60
Step-by-step explanation:
1. Subtract 8-3=5
2. Multiply 3*8.95=$26.85
3. Multiply 5*11.95=$59.75
4. Add $26.85+$59.75=$86.60