Simplify:
7a² + ab - 4a² + 2a + 8ba + 4a
Group terms
= (7a² - ?a²) + (ab + 8ba) + ( ? + 4a)

The interior angles formed by the sides of a hexagon have measures that sum to 720°. what is the measure of angle a? enter your answer in the box. m∠a= °

Given the lease terms below, what monthly lease payment can you expect on this vehicle? terms: •length of lease: 60 months •msrp of the car: $28,500 •purchase value of the car after lease: $12,900 •down payment: $1900 •lease factor: 0.0005 •security deposit: $375 •aquisition fee: $300 a.$232.50 b.$279.99 c.$227.50 d.$248.08

If the alternate hypothesis of an experiment is “the true mean height of the giraffes is more than 15 feet” what is the null hypothesis?