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daser333 [38]
3 years ago
5

Consider the function f(x) = x2 + 3x − 7. Find the value of f(x) when x = 3 and select the correct answer below. 5 8 11 18

Mathematics
2 answers:
REY [17]3 years ago
5 0
If <span>f(x) = x</span>²<span> + 3x − 7
then if your finding when x= 3 then simply subtitute x for three in the equation and then solve it

</span>∴     <span> f(3) = (3)</span>² + 3(3) - 7
              = 9 + 9 - 7
              = 11
BARSIC [14]3 years ago
4 0
8 because 3•2+3•3-7=8
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Read 2 more answers
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sesenic [268]
A'(t)=(\text{flow rate in})(\text{inflow concentration})-(\text{flow rate out})(\text{outflow concentration})
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e^{t/100}A'(t)+\dfrac1{100}e^{t/100}A(t)=6e^{t/100}+3e^{t/100}\sin\dfrac t4
\left(e^{t/100}A(t)\right)'=6e^{t/100}+3e^{t/100}\sin\dfrac t4
e^{t/100}A(t)=600e^{t/100}-\dfrac{150}{313}e^{t/100}\left(25\cos\dfrac t4-\sin\dfrac t4\right)+C
A(t)=600-\dfrac{150}{313}\left(25\cos\dfrac t4-\sin\dfrac t4\right)+Ce^{-t/100}

Given that A(0)=30, we have

30=600-\dfrac{150}{313}\cdot25+C\implies C=-\dfrac{174660}{313}\approx-558.02

so the amount of salt in the tank at time t is

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