The answer to the question
Step-by-step explanation:
let the 1st number be x
given,
2nd number = 10 less than 1st number = x - 10
3rd number = 2 times the 1st number = 2x
their sum = 74
a/q,
x + x - 10 + 2x = 74
after solving the equation,
→ x + x - 10 + 2x = 74
→ 4x - 10 = 74
→ 4x = 74 + 10 = 84
→ 4x = 84
→ x = 84/4 = 21
therefore,
1st number = x = 21
2nd number = 10 - x = 21 - 10 = 11
3rd number = 2x = 2 × 21 = 42
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Answer:
Step-by-step explanation:
We want to find the equation of a parabola withfocus at (-3,0) and directrix y=3.
This para has its vertex at the origin and opens downward.
The equation is of the form
Where p is the distance from the vertex to the focus.
This distance is p=|0-3|=3
We substitute p=3 to obtain:
Hence the equation is