De un grupo de 80 niños, se sabe que 50 estudian, 40 juegan y 15 estudian y juegan, ¿cuántos solo estudian?

Step-by-step explanation:

Portuguese - Brazil

Estudam - A

Jogam - B

A=50

B=15

A∩B = 15

Somente estudam = 50 - 15 = 35

Somente jogam = 25

Nem estudam nem jogam = 5

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!

3.how is solving radical equations different than solving linear equations?

step-by-step explanation: