Matt has earned $75. to buy a bicycle he needs twice that amount plus $30.How much does the bicycle cost?

$180

Step-by-step explanation:

he has earned 75 dollars and if he needs twice the amount, you would have to multiply 75 by 2. 75x2= 150. They also say plus 30 so you have to add 30 to 150. you answer is 180 dollars

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c