I hope that this made sense to you.
number 4 is x = 9 and number 5 is x = 10
The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle.
If a circle has a diameter of 4, its circumference is 3.14*4=12.56.
If you know the radius, the diameter is twice as large.
The equation would be 152 - 19 = X
X = 152 - 19
X = 133
There are 133 species of birds at the zoo
I think so because if she/he has 100 gallons and she/he drives 35 miles than she would have to waist but still have some gas left to use