In 4 years time a mother will be three times as old as her son. Four years ago she was five times as old as her son. Find their
1 answer:
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Answer:
(a)
Step-by-step explanation:
The tangent and the normal at point P are perpendicular.
Given
= 3, then
Given the gradient m of the tangent then the gradient of a line perpendicular to it is
= -
= -
→ (a)
Answer:
Step-by-step explanation:
The two ringtones will cost her a total of and is a fixed amount. The relationship between the cost and number of songs only is
and therefore the answer is
. You can also directly find the answer by finding the y-intercept (in this case
), as no other answer choices include the term
, so A must be the correct answer.