Neeed to be done

a) the ratio 20 minutes to 1 hour can be written in the form 1: n.
find the value of n. n=
b) the scale on a map is 1 : 25000
how many kilometres on the ground is represented by 9 cm on the map?

Identify one charcteristic of exponential growth

In a young single person's monthly budget, $150 is spent on food, $175 is spent on housing, and $175 is spend on other items. suppose you drew a circle graph to represent this information, what percent of the graph represents housing?

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.