Complete the two polynomials so their sum is 4m^2 + 2m. sum: (2m^2+ ___ ) + ( ___ + m ) = 4m^2 + 2m

Complete the two polynomials so their difference is 4m^2 + 2m.
difference : 5 (m^2 + ___ ) - ( ___ + 3m ) = 4m^2 + 2m

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What is the y-intercept of the line given by the equation

Three friends are comparing the prices of various packages of golf balls at a sporting goods store. hector finds a package of 6 golf balls that costs $4.50.

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