What is the best way to change sentence 4 from active voice to passive voice?

Do you have an image of sentence 4? I can't help you if I don't know what the sentence is, but I can explain.

Explanation:

To change something to passive voice means to turn it into past tense, for example; He is old and cranky. So you would take the word is and change it into a past tense word, such as this; He was old and cranky. This goes for active voice also except you are changing the past tense into present tense.

pressure should be applied to a wound as the best way to stop the bleeding

Explanation:

this is the correct answer for study island

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.