12. Ona do'konda 537000 so'm sarfladi. U sotuvchiga 5 ta 100000 so'mlik kupyura va 4 ta 10000 so'mlik kupyura berdi. Sotuvchi qancha qaytim berishi kerak?

A drug is injected into the bloodstream of a patient. The concentration of the drug in the bloodstream (in mg per \( \mathrm{cm}^{3} \) ) \( t \) hours after the injection is given by \[ C(t)=\frac{0.18 t}{t^{2}+3} \] Question \#2: Determine the instantaneous rate of change of the drug concentration after 30 minutes.

Magan is younger than Claire. Their ages are consecutive integers. Find Magan's age if the sum of Magan's age and 2 times Claire's age is 26 .

A) \( 12,7+525,39= \) \( 103,71-54,989= \) \( 25,2 \times 9,7= \) \( 46,55 \times 1,9 \)

Question The sum of three consecutive even integers is -66 . Find the value of the middle of the three.

b. El triple del ángulo \( 78^{\circ} 34^{\prime} 9^{\prime \prime} \).