When someone woke up in the morning the temperature was 4 degrees above zero. Would it be positive/negative?

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Pls never taught i’m really confused and i rlly need