Which of the following describes an example of mutually exclusive outcomes A and B for selecting a card at random from a standard 52-card deck?
A. A = the card is an ace, B = the suit is a spade
B. A = the card is a king, B = the suit is a heart
C. A = the card is black, B = the suit is a club
D. A = the card is 8 or less, B = the card is a king

sorry, i don't know i just need points, i'm new here. chao

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

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two

i would say true? if the unit was informational and it "refreshed your understanding", then true.