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Questions in mathematics

[Done] Consider the identity: $\frac{\cos \theta}{\sin \theta}-\frac{\cos 2 \theta}{\sin \theta \cdot \cos \theta}=\tan \theta$ 3.1 Prove the identity.

[Done] What is the cost of 18 toy cars? $12 $20 $22 $2.5

[Done] Write the monomial in its standard form. Name its coefficient and identify its degree: [tex]$2 \frac{1}{3} a^2 x\left(-\frac{3}{7}\right) a^3 x^2$[/tex]

[Done] What is the equation of the line that passes through $(0,2)$ and has a slope of $0$? A. $y=2$ B. $x=2$ C. $y=-2$

[Done] Eight less than four times a number is less than 56. What are the possible values of that number? x > 12 x < 12 x < 16 x > 16

[Done] Solve for $z$. $\frac{z-6}{2 z+1}=10$ $z=$

[Done] One member of a Pythagorean triplet is 18. Find the other two members of the triplet. Is 10, 24, and 26 a Pythagorean triplet?

[Done] Use the FOIL method to find the product below. $(x+5)(x^2-3x)$ A. $x^3+5x^2-15x$ B. $x^3+2x^2-15$ C. $x^3+5x^2-15$ D. $x^3+2x^2-15x$

[Done] $\frac{4}{6}+\frac{1}{3}$

[Done] If $a+b=c$ and $b=5$, then $a+5=c$ is known as the _______ property. A) substitution B) reflexive C) symmetric D) transitive