Will give brainliest if correct.

y=-3x+4

Step-by-step explanation:

To find the equation y=mx+b, we need to find b. We already have m, which is the slope. m=-3

To find b, we can plug in the point (3,-5) into the equation y=-3x+b

3 is x and -5 is y

-5=-3(3)+b

simplify

-5=-9+b

b=4

So, now we put b=4 into the original equation, and we get y=-3x+4

B

Step-by-step explanation:

Area of semicircle=(r^2×3.14)/2

=(4×3.14)÷2

=6.28

area of rectangle=3×4

12+6.28=18.28

perimeter of semicircle is =(d×3.14)/2

=4×3.14/2

6.28+3+3+4

6+10

perimeter=16.28