Acombined circuit has two resistors in parallel (34.0 ohms and 41.0 ohms) and another in series (15.0 ohms). if the power source is 9.0 volts, what will the current be?
i need to know the answer and exactly how the whole thing because i don't understand

Explain the doppler effect in terms of frequency, wavelength, and speed.

Acommercial passenger jet can travel up to 970 km/hr at an altitude of 30,000 feet. at this speed, how long will it take the jet to travel 1,865 kilometers? a. 2.3 hrs b. 1.9 hrs c. 1.7 hrs d. 1.5 hrs

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth