3 years ago

The reading speed of second grade students in a large city is approximately normal, with a mean of 89 words per minute

Mathematics

1 answer:

laila [671]3 years ago

4 0

Try using
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It can solve any mathematical problem

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2 years ago

2+2+4+32<br> please solve :D

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Step-by-step explanation:

2+2 = 4

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3 years ago

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Find the final total value of a 10-year investment of $3600 at a simple annual rate of

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3 years ago

12.2 gallons for $1.87 . how much did u spend on gas

GrogVix [38]

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3 years ago

What is the length of line PS

stiks02 [169]

$PQ^2 = PR \times PS$

$(4x + 4)^2 = (3x + 3)(3x + 3 + 21)$

$16x^2 + 32x + 16= (3x + 3)(3x + 24)$

$16x^2 + 32x + 16= 9x^2 + 81x + 72$

$7x^2 - 49x- 56 = 0$

$7(x^2 - 7x - 8)= 0$

$(x - 8)(x + 1) = 0$

$x - 8 = 0~~~or~~~x + 1 = 0$

$x = 8~~~or~~~x = -1$

x = -1 makes the lengths of segments PQ and PR equal zero.
That is not possible, so the solution x = -1 is discarded.

x = 8

PS = 3x + 3 + 21

PS = 3x + 24

PS = 3(8) + 24

PS = 24 + 24

PS = 48

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3 years ago