I’m doing this too hopefully someone answers quick cause I’m confused also.
Answer:
x+7
Step-by-step explanation:
Remove Parentheses
Collect like terms
Calculate
Answer:
C
Step-by-step explanation:
The correct question is
Use the given information to find the exact value of the expression. sin α = 21/29, α lies in quadrant II, and cos β = 15/17, β lies in quadrant I Find sin (α - β).
we know that
sin(α − β<span>) = </span>sin α cos β − cos α sin β
α lies in quadrant II
so
cos α is negative
sin α is positive
β lies in quadrant I
so
cos β is positive
sin β is positive
step 1
find sin β
cos β=15/17
sin² β+cos² β=1-----------> sin² β=1-cos² β----> sin² β=1-(15/17)²
sin² β=1-225/289-----> 64/289
sin β=8/17
step 2
find cos α
sin α = 21/29
cos² α + sin² α=1----> cos² α=1-sin² α---> cos² α=1-(21/29)²---> 1-441/841
cos² α=400/841------> cos α=-20/29 (remember cos α is negative)
step 3
find sin(α − β)
sin α = 21/29 cos α=-20/29
sin β=8/17 cos β=15/17
sin(α − β) = [21/29]*[15/17] − [-20/29*]*[8/17]
sin(α − β) = [315/493] − [-160/493]
sin(α − β) = 475/493
the answer is
sin(α − β) = 475/493
After value putting, if the number of guests represented by the variable (g) is 17 then the cost pf the food is $220.
In the given question we have to evaluate the expression if the number of guests represented by the variable (g) is 17.
An expression to represent the cost of the food for a catered lunch is 50+10g.
The fee for the catering is $50 and then there is a $10 charge for each lunch box.
Since g is representing the number of guests.
The the value of g is given 17.
Now putting the value of g in the given expression.
=50+10g
=50+10*17
=50+170
=220
Hence, if the number of guests represented by the variable (g) is 17 then the cost pf the food is $220.
To learn more about value putting link is here
brainly.com/question/4824769
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