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# If triangle DEF has a 90° angle at vertex E, which statements are true? Select two options. Triangle DEF is an obtuse triangle. The angle at vertex D is acute. The angle at vertex F is obtuse. Triangle DEF is a right triangle. The angle at vertex D is obtuse.   ### Another question on Mathematics Mathematics, 21.06.2019 14:30
Na calculadora, apertei algumas teclas. depois, pressionei tres vezes a tecla =, e apareceu a sequência: 420 a-) quais teclas apertei inicialmente? b-) se eu apertar mais três vezes a tecla =, que números aparecerão? Mathematics, 21.06.2019 15:00
Avenues a, b, and c are parallel to each other, and are perpendicular to 7th street. what is the length (x) of the block on broadway between avenues b and c to the nearest tenth Mathematics, 21.06.2019 16:10
Determine whether the following statements are true and give an explanation or counterexample. bold a. when using the shell​ method, the axis of the cylindrical shells is parallel to the axis of revolution. bold b. if a region is revolved about the​ y-axis, then the shell method must be used. bold c. if a region is revolved about the​ x-axis, then in principle it is possible to use the​ disk/washer method and integrate with respect to x or the shell method and integrate with respect to y. Mathematics, 21.06.2019 17:00
An airplane consumes fuel at a constant rate while flying through clear skies, and it consumes fuel at a rate of 64 gallons per minute while flying through rain clouds. let c represent the number of minutes the plane can fly through clear skies and r represent the number of minutes the plane can fly through rain clouds without consuming all of its fuel. 56c+64r < 900056c+64r< 9000 according to the inequality, at what rate does the airplane consume fuel while flying through clear skies, and how much fuel does it have before takeoff? the airplane consumes fuel at a rate of gallons per minute while flying through clear skies, and it has gallons of fuel before takeoff. does the airplane have enough fuel to fly for 60 minutes through clear skies and 90 minutes through rain clouds?
If triangle DEF has a 90° angle at vertex E, which statements are true? Select two options.
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