Carlos gasta en la tienda 50 lempiras en la compra de 4 borradores. ¿Cuánto gasta si compra 1,2,3 y 5 borradores?R.

On a piece of paper graph f(x)=5•(0.4)^x

Can someone pls ! pls answer all. no explanation needed..

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.