I only (sort of) know 3 and 4
3. Andle 1 is an example of an angle bigger than

I don't know what you call it.
4. If you have a straight line, both angles (or more) added up need to be

so if angle 1 is 129, 180-129=51
angle 2 is

If 1 is what is the relationship between the two angles, then maybe the answer is that they both added up need to be 180 degress (?)
And 2 is probably the same as 3 but with angle 2, angle two is an example of an angle smaller than 90 degrees
The answer is 4. You take 2 and divide it by 0.5.
Step-by-step explanation:
log <base a> b = x
means
a^x = b
So
3^2 = x^2+7x+21
x^2 + 7x + 21 - 9 = 0
x^2 + 7x + 12 = 0
(x+3)(x+4)
x = -3 or -4
The answer is 28.26 because to find the area of a circle you need to do pie time radius squared.
Answer:
77.5 cm
Step-by-step explanation:
15.5km* 5 cm on map/ 1 actual km= so 77.5 cm
if my answer helps please mark as brainliest.