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3 years ago

Estimate each product or quotient: PLEASE HELP through 11,13,15 and explain how you got your answer

Mathematics

1 answer:

Ostrovityanka [42]3 years ago

6 0

11. 8.73 x 6.01....estimation : 9 x 6 = 54
13. 197.4 x 2.85...estimation : 197 x 3 = 591
15. 479.2 x 3.2...estimation : 479 x 3 = 1437

all I did was round the numbers to the nearest whole number, then just multiplied

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Sergey is solving 5x2 + 20% – 7 = 0. Which steps could he use to solve the quadratic equation by completing the

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Answer:

$5(x^2+4x)=7$

$5(x^2+4x+4)=7+20$

$(x+2)=\pm\sqrt{\frac{27}{5}}$

Step-by-step explanation:

we have

$5x^2+20x-7=0$

step 1

Group terms that contain the same variable, and move the constant to the opposite side of the equation

$5x^2+20x=7$

step 2

Factor 5 left side

$5(x^2+4x)=7$

step 3

Complete the square

$5(x^2+4x+2^2)=7+2^2(5)$

$5(x^2+4x+4)=7+20$

$5(x^2+4x+4)=27$

step 4

Rewrite as perfect squares

$5(x+2)^2=27$

step 5

$(x+2)^2=\frac{27}{5}$

$(x+2)=\pm\sqrt{\frac{27}{5}}$

$(x+2)=\pm\frac{3\sqrt{15}}{5}$

step 6

$x=-2\pm\frac{3\sqrt{15}}{5}$

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Answer:

Point Form:

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Equation Form:

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Step-by-step explanation:

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