Write the sum or difference in the standard form a + bi.(7 + 9i) - (-5 + i)
A. -12 - 8i
B. 2 + 10i
C. 12 - 8i
D. 12 + 8i
Answer: D
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Find the sum, if it exists.
A. - 
B. 
C. 
D. Does not exist
Solve the problem.A projectile is fired from a cliff 100 feet above the water at an inclination of 45° to the horizontal, with a muzzle velocity of 210 feet per second. The height h of the projectile above the water is given by 
where x is the horizontal distance of the projectile from the base of the cliff. How far from the base of the cliff is the height of the projectile a maximum?
A. 344.53 ft B. 1133.59 ft C. 444.53 ft D. 689.06 ft
Solve the equation.8(x + 4) + 3 = 4 + 7x
A. - 31 B. 39 C. 31 D. 3
A parabolic archway has the dimensions shown in the figure. Find the equation of the parabolic portion.
?
ft, 
ft, 
ft, 
ft
?
?
A. 
B. 
C. 
D. 