We initially have 100 grams of a radioactive element and in 1250 years there will be 80 grams left... determine the exponential decay equation for this element. A. Q=100e^-0.0001785t B. Q=80e^-0.0001785t. C. Q=100e^-1.785t d. Q=100e^2.07944t

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!