Use substitution to determine the solution of the system of equations. Write the solution as an ordered pair. x + 2y = 14 y = 3x − 14 PLEAS HELP

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec

The tree filled 3/4 of a cup in 1/2 and hour at what rate does syurup flow from the tree

2f(x)= x+3 if 4 < x < 8 2x if x 28 2