20 POINTS Which quadrilaterals always have consecutive angles that are supplementary?

A. Parallelograms

B. Rectangles

C. Rhombi

D. Squares

Which quadrilaterals always have diagonals that are perpendicular?

A. Parallelograms

B. Rectangles

C. Rhombi

D. Squares

Which quadrilaterals always have diagonals that bisect each other?

A. Parallelograms

B. Rectangles

C. Rhombi

D. Squares

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

$5.41

step-by-step explanation:

$20 - $14.51 = $5.49.

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places