Answer:
D
Step-by-step explanation:
Using trigonometric ratios in the right triangle
tan45° = 1 and cos45° = ![\frac{1}{\sqrt{2} }](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%5Csqrt%7B2%7D%20%7D)
tan45° =
= ![\frac{b}{7}](https://tex.z-dn.net/?f=%5Cfrac%7Bb%7D%7B7%7D)
Multiply both sides by 7
7 × tan45° = b, that is
b = 7 × 1 = 7
--------------------------------------------------------
cos45° =
= ![\frac{7}{a}](https://tex.z-dn.net/?f=%5Cfrac%7B7%7D%7Ba%7D)
Multiply both sides by a
a × cos45° = 7, that is
a ×
= 7
Multiply both sides by ![\sqrt{2}](https://tex.z-dn.net/?f=%5Csqrt%7B2%7D)
a = 7![\sqrt{2}](https://tex.z-dn.net/?f=%5Csqrt%7B2%7D)
Answer:
it's AAS is my opinion
Step-by-step explanation:
The standard equation for a parabola that opens upward parallel to the y-axis is x2=4ay, where a = distance from the vertex to focus. Vertex is at origin(0,0)
4a=2
a=2/4
a=1/2 or 0.5
the coordinate of the focus is (0, 1/2)
the equation of the directrix is y=-1/2
Answer: d
Step-by-step explanation:
Answer: i think it represents 1 if that is an answer
Step-by-step explanation: