Which of the following identifies the main reason inventing the light bulb involved a long trial and error process?


The light bulb parts needed to be reliable.

The light bulb parts needed to be economical.

The light bulb parts needed to withstand heat.

The light bulb parts needed to withstand pressure.

Graph the line.y=3x Disciplina que estudia situaciones del cuerpo humano en las cuales lo correcto y lo incorrecto esta en juego Which point would not be a solution to the system of linear inequalities shown below? y\ge x+5\hspace{50px}y\ge\frac{2}{3} x+6 yx+5y 3 2 x+6 (12, 7) (-12, 1) (-12, 9) (-12, 6) pls help its my last day of school and a have only a few mins to submit What is atmosphere in literature?ochO the attitude of a text toward the subject and themeO the emotional response a text generates from a readerO the author's opinion of the subject and the audienceO the narrator's perspective in relation to the characters. which conclusion regarding African trade is supported by the information provided by the map? *Please choose the correct answer. HELP ASAP1.The kingdom of Zimbabwe grew from trade with Egypt2.The kingdoms of Western Africa traded with the city states of the Eastern Africa.3.The Congo and Zambezi Rivers played an important role in Africas early trade.4. The West African kingdoms had trading contacts with the cities of the Mediterranean. Please help asap!! I will mark you as brainliest :) Is my answer correct? figure B is a scaled copy of figure A. What is the scale factor from figure A to B Which is the decimal expansion of the following 1/5 A scenario where reaction time is important is when driving on the highway. During the delay between seeing an obstacle and reacting to avoid it (or to slam on the brakes!) you are still moving at full highway speed. Calculate how much distance you cover in meters before you start to put your foot on the brakes if you are travelling 65 miles per hour. Whats a claim and a counterclaim in a text put simple Un cuerpo permanecer en movimiento rectilneo uniforme o en reposo si la fuerza neta sobre l es nula o si sobre este no acta ninguna fuerza". A qu concepto corresponde la definicin? * help pls. cant figure it out One side of a triangle is 3 times longer than the shortest side and the third side is 4 centimeters longer than the shortest side. The perimeter of the triangle is 64.How long is the shortest side of the triangle? Andrs est comprando un___electrnico. Lo paga con una ____de crdito.FREE ((PLEASE HELPP)Arrange the systems of equations in order from least to greatest based on the number of solutions for each system. 1.)-5x+y=10 -25x+5y=502.)3x-7y=9 -4x+5y=13.)y=6x-2 y=6x-4 How was Andrew Jackson self serving? Please hurry Im in a tes what is the solution to x^2 + 6x +7 Researchers at a medical school conducted a study to test the effectiveness of a new drug for lowering cholesterol. The 52 subjects who volunteered for the study were each given a randomly generated number. Subjects with an odd number were given the new drug, while those with an even number were given a placebo. Cholesterol levels before and after the treatment were measured for each subject, and the differences were computed.This study is an example of ______________ study. The difference in cholesterol level is _____________ the variable. The treatment with drug or placebo is the ____________ variable.