Which of the sets shown includes the elements of set z that are both odd numbers and multiples of 7?

z = {−21, −14, −7, 0, 7, 14, 21}

a. {−21, 21}
b. {−21, −7, 7, 21}
c. {−14, 0, 14}
d. {−21, −14, −7}

Solve for x, y, and z. show all steps.

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

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?