Un deportista de atletismo de alto rendimiento pudo determinar que por cada día de entrenamiento disminuye un segundo en su registro personal. Su marca actual es de 9 minutos. Para poder participar en los Juegos Olímpicos de Brasil 2016, requiere bajar su registro a los dos tercios de su marca actual. ¿Cuántos días requiere entrenar para poder participar en los Juegos Olímpicos de Brasil 2016?
a. 360 días
b. 120 días
c. 60 dias
d. 180 días

here the number -5 is all of the following except a rational number.

step-by-step explanation:

i think it's ф or x=6,-6

step-by-step explanation:

-x^2=-36

x^2=-36

ф

or

if you mean by : -(x^2)=-36

it'll be: x^2=36

x=6,x=-6

hope it'll ! have a good day!

you for asking!

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!