6. Which number lies halfway between:
a) 259 and 361​

310

Step-by-step explanation:

Find the average of the 2 numbers, by adding them and dividing the result by 2, that is

= = 310 ← middle number

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.