The u. s. weather bureau has a station on mauna loa in hawaii that has measured carbon dioxide levels since 1959. at that time, there were 311 parts per million of carbon dioxide in the atmosphere. in 2005, the figure was 375 parts per million. find the increase in carbon dioxide levels and the percent of increase. round to the nearest tenth of a percent.

here were 328 parts per million of carbon dioxide in the atmosphere in 1959.

there are 414 parts per million of carbon dioxide in the atmosphere in 2017.

the increase is 414 - 328 = 86 parts per million.

the ratio of the increase to the amount in 1959 is 86 / 328 = .262.

the percent increase is 100 times that and is equal to 26.2%.

Step-by-step explanation:

i dont know i just need points

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!