29.99-20%= 23.99
25.00-10%= 22.50 so, Mr.chang got the better deal ( but not by much.)
Answer:
1.125,−1.125
Step-by-step explanation:
64x^2+10=91
64x^2+10−10=91−10
64x^2=81
64x^2
/64 = 81
/64
x^2=
81
/64
x=±√
81
/64
x=1.125,−1.125
Angle R is the reference angle as its the only given angle (other than the 90 degree angle).
Opposite angle R is segment PQ
PR is the hypotenuse
Use the sine rule to find that...
sin(angle) = opposite/hypotenuse
sin(R) = PQ/PR
sin(19) = PQ/11
11*sin(19) = PQ
PQ = 11*sin(19)
PQ = 3.58124969902872 <<-- use a calculator (degree mode)
PQ = 3.58
Answer: 3.58
There's not enough information given to answer number 22.
