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Questions in Grade Middle-school

[Answered] Is blood acidic, basic, or neutral?

[Answered] Factor [tex]x^2 + 7x - 18[/tex].

[Answered] A sequence \(\{a_n\}\) is generated by the recursive formulas \(a_1 = 5\) and \(a_n = a_{n-1} + 5(-1)^n\). Find \(a_{343}\), the 343rd term of the sequence.

[Answered] Find the center, vertices, and foci of the ellipse with the equation [tex]5x^2 + 8y^2 = 40[/tex].

[Answered] Simplify: \[ \cos(126^\circ)\cos(36^\circ) + \sin(126^\circ)\sin(36^\circ) \]

[Answered] Estimate the maximum error made in approximating [tex]e^x[/tex] by the polynomial [tex]1 + x + \frac{1}{2}x^2[/tex] over the interval [tex]x \in [-0.4, 0.4][/tex].

[Answered] There were 420 birds migrating to the south in the sky this morning. If the ratio of godwits to geese was 20:40, how many more geese were in the sky?

[Answered] Which of the boys is the understood leader? How do you know this? Refer to the book *Holes*.

[Answered] Express the number 375,940,000,000 in scientific notation.

[Answered] Is hydroelectric energy inexhaustible?