Question

The temperature decreases 4° every 2 hours for 6 hours. Which expressions match this situation.


(-4)(3)


(-2)(-6)


(-4)(6)


3(-4)

Answer 1

The correct expressions are (-4)(3) and 3(-4).

Reason: In 6 hours there are 6 ÷ 2 = 3 decreases, each of -4°, so total change = 3 × (-4) = -12°.
(-4)(6) would mean -4° each hour for 6 hours (−24°). (-2)(-6) equals +12°, which has the wrong sign.