Please i need someone to explain how to do these i dont need answers yes they will help but i have a key but i just wanna understand it.

(-3i) (-7i) (2i)

20000 as first it increases by 2500 then by 5000 so next it will increase by 10000

J= r + 9 because since jessica rode 9 more miles than roger, you add 9 miles to rogers mileage.

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )