Select the pair of equations whose graphs are perpendicular!? A) 5x-8y=9, 12x-5y=7;

B)y=2x-7, x+2y=3

C)x +6y=8, y=2x-8;

D)2y=-3x+5, 2x+3y=4..

Need ASAP

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Marlow is comparing the prices of two trucks rental compaines company a charges $3 per hour and an addtional $75 as serivce charges company b charges $2 per hour and an additional $85 as serivce charges

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.