The probability of having identical twins is approximately 35 ten thousandths or 0.0035^2. Express the number in scientific notation. Please I’m so confused

Which of the following lines is parallel to x=4? a- 3y=9 b- y=4 c- x=2 d- x=y answer this as soon as possible xoxo lo ; )

Me. i can't figure out this question. give an explanation too. .

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.