Convert imaginary number i to exponential form. Select the correct response: O e^j90 e^-jrt O e'jirt O e^jr/2

If you stand on top of s building 240 ft high and drop a rock, the equation h= 240-16t^2 gives the height of the rock above the ground t seconds after it is dropped. How many seconds does it take the rock to reach the ground ? Round the answer to three decimals places.

Solve: log,(x-4) - 1= 1

Write the number 4\times 10^{3}4×103 in standard form.

Write as a single logarithm:     Please write Clearly  Thank you

At 7:00am, Alicia pours a cup of tea whose temperature is 200 degrees. The tea starts to cool to a room temperature of 72 degrees. An exponential model for the temperature of the tea is y = 128(0.988)^x+ 72, where y is the temperaturex minutes after 7:00 amwill tea when its temperature x is minutws after 7:00am. Alicia will drink the tea when its temperature is 170 degrees. When can Alicia drink the tea?