Is the speed on this graph increasing or constant?

The speed is constant.

Explanation:

The equation for a straight-line graph is  

y = mx + b

where m and b are constants.

m is the slope of the line and b is the y-intercept.

If we change the variables, the equation becomes

d = mt + b

Since m is constant, so is the speed.

wher is the rest of the question

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally