Mathematics, 02.11.2020 08:30, iva60

What is the square root of -1?

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Mathematics, 20.06.2019 18:04, Uc34758

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

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Mathematics, 21.06.2019 19:00, jis0

The quadratic function h(t)=-16.1t^2+150 choose the graph representation

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Mathematics, 21.06.2019 21:30, GOOBER3838

80 points suppose marcy made 45 posts online. if 23 of them contained an image, what percent of her posts had images? round your answer to the nearest whole percent. 54 percent 51 percent 49 percent 48 percent

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Mathematics, 21.06.2019 23:00, ronaldotheexplorer12

The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?