12. a) How many numbers of 5 digits can be formed from the digits 4, 5, 6, 7, 8, 9 (no digit being repeated)? How many of these numbers are divisible by 5? b) How many different even numbers can be formed from the 5 digits 3, 5, 6, 7, 8? odd numbers less than 1000 can be formed using the digits 0,2,4,5,7? c) How many vo​

30.5*10=350$

you have to multiply the number without the decimal point then add it later but if its tenn u must move the place value of the decimal point 1 to the right.

the answer to your question is c.)   volcanoes built the mountains and earthquakes tore them down.

step-by-step explanation:

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).