Zadanie 1 str 190 Poziom D matematyka z kluczem kl 7 proszę potrzebuje na teraz

Multiply −2x(6x^4−7x^2+x−5) express the answer in standard form. enter your answer in the box.

Asequence is defined recursively by the formula  f(n  +  1)  =  f(n)  +  3 . the first term of the sequence is  –4. what is the next term in the sequence? –7–117

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil