original price = p
p - 0.27p = $ 219
0.73p = $ 219
p = $ 219 / 0.73
p = $ 300
What information do you have to work with?
Are you given the area or circumference or something like that?
\(\frac{117}{x}=\frac{144}{100}\)
Now just solve for x.
\(117=x\cdot\frac{144}{100} \\~\\ 117\cdot\frac{100}{144}=x \\~\\ \frac{11700}{144}=x \\~\\ 81.25=x\)
117 is 144% of 81.25
We want to solve this equation for x.
x2 + x - 6 = -4
Add 4 to both sides.
x2 + x - 2 = 0
Factor.
(x + 2)(x - 1) = 0
Set each factor = 0 and solve for x.
x + 2 = 0 and x - 1 = 0
x = -2 and x = 1
Which is b)
\((\frac47)^{-2}=\frac{4^{-2}}{7^{-2}}=\frac{7^2}{4^2}=\frac{7*7}{4*4}\)
And... \(\frac{7*7}{4*4}=\frac{49}{16}\) :)
The mean of this list of numbers = \(\frac{60+31+24+50+44+88}{6}=\frac{297}{6}=49.5\)
First press the 2nd button in the top left, then press "acos"
Also, you can type in " acos( ) ," " arccos( ) ," or " cos^-1( ) " into the bar.
Oh okay.. Thank you Alan
Does the problem really say that cos θ = 8 ?
The cosine of any real angle has to be between -1 and 1 (inclusively)
... I don't know what it means if the cosine really is bigger than 1 !
\(\frac{x}{x}=1\) only if x ≠ 0
