8x + 4(3x + 3)

i need this simplified i need step by step instructions

Np4=12np2 with clear explanation.

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Select the lengths in centimeters that would form a right triangle