Answer:

Step-by-step explanation:
Given

To express as a rational number with 91 on the denominator.
91 ÷ 7 = 13
Thus multiply the numerator and denominator by 13, that is
= 
Answer:
Step-by-step explanation:
81/153 x/100
81•100=8,100
8,100/153
52.9
Answer:
1. I have simplified the first question:

2. I have found the parabola properties:

Answer: I think it’s 4
Step-by-step explanation:
Because by using a scale factor of 4 and 5 to simplify is 2
Answer:
Obtuse
Step-by-step explanation:
The sum of squares of the short sides is 130, so is less than the square of the long side. The long side (12) is longer than it would need to be for a right triangle, so the largest angle is bigger than 90°.
The triangle is obtuse.
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A triangle solver app or calculator can confirm this. Note angle C is about 96°, an obtuse angle.