A soma de um número x com o dobro de um número y é – 7, e a diferença entre o triplo desse número
x e número y é igual a 7. Sendo assim, é correto afirmar que o produto xy é igual a:
a) -15
b) -12
c) -10
d) -4
e) - 2

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655

Y=21.95x+10 y=22.45x solve by substitution