For First Question:
As, we find the value of x for parallel condition of line a and b
so, m∠3 = m∠1 and m∠2 = 180°-m∠1 = 180°-(2x+15)° [ As straight line contain total 180°]
Now,
m∠2 = <span>m∠6 [ Because they are corresponding angles]
180</span>-(2x+15)=(3x+10)
180=3x+10+2x+15
x= 31 satisfies the condition of a||b
For second Question:
As, it is issoceles triangle So side AC = side BC So, m∠A=<span>m∠B
</span>4x+5=5x-1
x=6
So,
m∠A=29° and triangle contain total 180°
<span>m∠C=180-29-29
</span> =122°
Option D is correct
This will take me a long time, but...
Answer:
383.333333333333... or 383 
Step-by-step explanation:
Note: Using a calculator is best.
1. Divide 100 by 24, you get 4.166666667
2. Multiply 92 by 4.16666667
3. You get 383.33333333333
4. You can check by multiplying this by 0.24, you'll get 92.
A safe bet would be to go from 0-70 with increments of 2.
