Find the vertex, focus, and directrix of the parabola. Graph the parabola.y2 + 8y = 4x + 4
A. vertex: (-5, -4)
focus: (-5, -5)
directrix: y = -3
B. vertex: (-5, -4)
focus: (-5, -3)
directrix: y = -5
C. vertex: (-5, -4)
focus: (-6, -4)
directrix: x = -4
D. vertex: (-5, -4)
focus: (-4, -4)
directrix: x = -6
Answer: D
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Use a proportion to solve the problem.A quality-control inspector examined 260 calculators and found 10 of them to be defective. At this rate, how many defective calculators will there be in a batch of 18,200 calculators?
A. 70 calculators B. 2600 calculators C. 700 calculators D. 7 calculators
Find the constant of proportionality for the stated conditions: z is directly proportional to the sum of x and y, and when src="https://sciemce.com/media/3/ppg__cognero__2.6_Proportion_and_Variation__media__926b1ba5-ad7f-4485-8393-c077879cb50a.PNG" class="wirisformula" align="middle" style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_a02714e1163f44d991c03522b" />.
, 
and
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A. ?
B. ?
C. ?
D. 
E. ?
Solve the equation. 3(x + 11) + 1 = - 3(x + 5) + 7
(a) - 18 (b) 7 (c) 3 (d) 10 (e) - 7
Solve by completing the square.x2 + 4x = 7
A. -2 ± 
B. -2 ± 2
C. 2 + 
D. -1 ± 