Tell weather the two rates form a proportion. help

1 answer:

6 0

7/9 = 42/54...when 42/54 reduces, it becomes 7/9...so this is proportional because proportions are nothing but equivalent fractions.

u could also check it this way...
12/21 = 15/24
cross multiply
(21)(15) = (12)(24)
315 = 288.....these do not equal and are therefore, not proportionate

440/4 = 300/3
110 = 100....not equal, so not proportionate

120/5 = 88/4
24 = 22.....not proportionate

66/82 = 99/123
0.804 = 0.804.......these are proportional

68/172 = 43/123
0.395 = 0.349......nope, not proportional

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I need help plz, i will give brainliest for the correct answer

DanielleElmas [232]

Answer:

f'(1) exists: f'(1) = -2
f'(0) DNE

Step-by-step explanation:

The function is continuous for x > 0 . The derivative is defined on that interval and is equal to ...

f'(x) = -2x . . . . . for x > 0

Then at x = 1, the derivative is ...

f'(1) = -2(1)

f'(1) = -2

The function has a jump discontinuity at x=0, so the derivative does not exist at that point. A condition for the existence of the derivative is that the function is continuous at the point of interest.