Let \( f(t) \) be the weight (in grams) of a solid sitting in a beaker of water. Suppose that the solid dissolves in such a way that the rate of change (in grams/minute) of the weight of the solid at any time \( t \) can be determined from the weight using the forumula: \( f^{\prime}(t)=-1 f(t)(5+f(t)) \) If there is 1 grams of solid at time \( t=2 \) estimate the amount of solid 1 second later.

average rate at which the water level changed every week. \( 1 \frac{1}{2} \) \( 1 \frac{2}{3} \) The water level changed by \( \square \mathrm{in} \). per week. (Simplify your answer. Type an integer, proper fraction, or mixed number.)

If a rolling device rolls down a 1.2 meter table in 10 seconds, what was the average speed of the object in \( \mathrm{m} / \mathrm{s} \) ? (Give a number answer only in units of \( \mathrm{m} / \mathrm{s}! \) )

สองเท่าของจำนวนหนึ่งรวมกับ 3 มี ค่าเท่ากับ 21 จงหาจำนวนนั้น

ii) \( \int \frac{x^{2}-2 x}{x} d x \cdot(4 n \)

10. \( 33942276 \quad 11.7 \)