Answer:
46.25% is the percent of the change in the price of a cell phone from 2000 to today.
Step-by-step explanation:
Cost of a cell phone in the year of 2000. C= $240
Cost of a same cell phone today, C'= $129
The percent of the change in price:
:
46.25% is the percentage of the change in the price of a cell phone from 2000 to today.
Answer:
Step-by-step explanation:
Use this formula,
where n is the amount of even intergers, a is the starting term, d is the common difference.
Answer:
constant of variation = 3
Step-by-step explanation:
we know that b varies jointly with c and d
so:
b∝c∝d
and b varies inversely with e, so
b∝
and i will call the constant of variation k, this way we can make an equation for b in the following form:
this satisfy that b varies jointly with c and d (if b increases, c and d also increase) and inversely with e (if b increases, e decreases)
we know that when b is 18, c is 4, d is 9, and e is 6:
substituting this in our equation for b:
and we solve operations and clear for the constant of variation k:
the constant of variation is 3.