The date of the first sighting of robins has been occurring earlier each spring over the past 25 years at a certain laboratory. Scientists from this laboratory have developed two linear​ equations, shown​ below, that estimate the date of the first sighting of​ robins, where x is the year and y is the estimated number of days into the year when a robin can be expected. Complete parts a and b. ​(Hint: 2000 was a leap​ year.) y = 698−0.304x
y = 1539−0.736x

Solve this system of equations to find the year in which the two estimates agree.

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.

11.2

step-by-step explanation:

when doing tangent the tangent of the angle is equal to the opposite side from the angle over the adjacent side to the angle.

tan43 = x / 12

move 12 over by multiplying each side by 12

12tan43 = x

x = about 11.2