I need help with 3 and 4 please lololl

What is the simplified form of 7 √x • 7 √x • 7 √x • 7 √x?

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

Simply 8x squared + 5(7x squared- x) - 2x =