Answer the question below:   If Jim decreases the strength of an acid he is playing with, the concentration of ions in that acid falls or rises?    Assuming that:  A stronger acid produces a greater concentration of ions than a weaker acid.
falls

(Question)
Answer the question below:   The thinner a resistor equals less or more resistance?    Assuming that:  Thicker resistors offer less resistance than thinner resistors.
(Answer)
more

Ques: Answer the question below:   Mary loves to observe the Sun. If she's looking at the Sun one day and notices less sunspots then she usually sees, what is happening to the amount of solar energy reaching the Earth increasing or decreasing?    Assuming that:  When there are more sunspots the Sun is more active and there are more solar storms and more of the Sun's energy reaches the Earth.
Ans: decreasing

(Q).
Answer the question below:   What happens to water when it absorbs less salt lower density or Higher Density?    Assuming that:  Water becomes more dense when it is colder and when it has more salt.
(A).
lower density

Ques:Answer the question below:   As the train approached the intersection and blew its horn, compressing the wavelengths of the sound, did the frequency of the horn increase or decrease??    Assuming that:  This means that as wavelengths get shorter, more waves move past a particular spot in the same amount of time.

Ans:increase

Ques:Answer the question below:   If one trains aerobic exercises, their heart muscles will become stronger or weaker?    Assuming that:  Aerobic exercise increases the size and strength of muscles in the heart and helps all your muscles develop greater endurance.

Ans:
stronger