We have a linear function $\displaystyle\bf y=\underbrace{k}_{gradient}x+b$ and we know that $\displaystyle\bf \left \{ {{-2\cdot-3+b=2} \atop {-4\cdot -2+b=k}} \right. => \left \{ {{b=-4} \atop {b+8=k} \right. => k=8-4=4 \\\\Answer: \boxed{B) \quad k=4}$

6 0

3 years ago

How do I calculate the perimeter and the area

patriot [66]

It is a semicircle so you'd use this formula for the area:

πr² / 2

Then substitute 2 into r and solve (2 because it's the radius, 4 is the diameter)

You would use this formula for the perimeter:

(πd / 2) + d
or
πr + 2r

Then substitute 4 into d / 2 into r and solve.

Hope I helped :)

3 0

3 years ago