A company provides bus trips to various events. The company charges $15 for each adult, a, and $8 for each child, c, for a trip. For an upcoming event, the company will provide transportation for 40 people and will earn $390. Which system of equations represents this situation?

Find the balance at the end of 4 years if 1000 is deposited at the rate of

Find the gradient of f(x, y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

How do i do this activity, is appreciated