Which of the following circles have their centers on the y-axis?

a.(x - 0)^2 + (y - 0)^2 = 44
b.(x + 1)^2 + (y - 7)^2 = 16
c.(x - 4)^2 + (y - 0)^2 = 22
d.(x - 0)^2 + (y + 5)^2 = 74

the answer is actually (x - 0)^2 + (y + 5)^2 = 74 and (x - 0)^2 + (y - 0)^2 = 44 on apex

Circles A and D have their centers on y-axis.

Step-by-step explanation:

The standard form of a circle is given by

Here (h,k) is the center and r is the radius of the circle.

Now, any point which is in the y- axis has x-coordinate equal to zero.

Since, center of the circle is in y-axis. Hence, x coordinate of the circle is zero. Thus, h = 0

From the given options, circles A and D have their centers on y-axis.

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!