Half life can be used to solve for the amount (A) of a substance left after t time by using the following equation: A=A0⋅(12)th If the half life of a substance is 4 weeks, how long will it take for 400 mg of this substance to decay to 25 mg? Select one: A. 16 weeks B. 8 weeks C. 13 weeks D. 6 weeks

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation:

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step-by-step explanation:

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third choice down

step-by-step explanation:

the first inequality is based on the number of adults and campers, and the second inequality is based on the cost of feeding both the adult and the camper.

we know that there is room for 525 people max.   it's ok to have less than 525, but it's not ok to have more than 525, so the inequality is less than or equal to.   the number combination of adults (x) and campers (y) cannot exceed this 525 max.   therefore:

x + y ≤ 525

now we talk about cost.   it costs $9 to feed one adult, so depending upon the number of adults you have (x) depends upon how much it will cost to feed that number of adults.   same with the campers, who cost $5 to feed.   the adults can be represented by 9x and the campers can be represented by 5y.   since the budget cannot exceed 1,200, the second inequality is:

9x + 5y ≤ 1200

the easiest way to do these would be to solve the equations. if you can solve the equation than you can solve these problems.