Select all equations that can represent the question: “How many groups of 4/5 are in 1?” (a) ?⋅1=4/5
(b) 1⋅4/5=?
(c) 4/5÷1=?
(d) ?⋅4/5=1
(e) 1÷4/5=?

d & e

Step-by-step explanation:

“How many groups of 4/5 are in 1?”

In fact, there are actually 1/(4/5) groups of 4/5 in 1 = 1.25

The correct answers are d & e

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2