Answer:
Step-by-step explanation:
<u> 4km</u>
*
* 
4km ÷ 10.73 km/hr = .37 hr = 22.3 minutes
Answer:
255mm squared
Step-by-step explanation:
it is true i got it wrong and found out the hard way
Answer:
11x -8y = -9
Step-by-step explanation:
8x-4y=-4
-3x+4y=5
Subtract the second equation from the first
8x-4y=-4
-(-3x+4y=5)
-----------------------------
Distribute the minus sign
8x-4y=-4
+(3x-4y=-5)
-----------------------------
11x -8y = -9
The formula for half-life is:

A is the amount remaining, P is the initial amount, t is the time that has passed, and h is the half-life of the substance. Plug in the values that you know and solve:

Rounded to the nearest whole number, the density of the substance was about 13<span>mg / cm².</span>