The score distribution of david’s accounting exam is normal with a mean of µ = 121 and a standard deviation of σ = 12. the lowest 16% of the students will fail the exam. david must score at least points to pass.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?

What is the area of the shaded sector?