3 years ago

Evaluate the expression when y=5. p²+5y-7

Mathematics

1 answer:

drek231 [11]3 years ago

3 0

Answer:

$p^{2}$ + 18

Step-by-step explanation:

Substitute 5 for the y in the problem. 5y means 5 times y.

$p^{2}$ + 5*5 - 7

$p^{2}$ + 25 - 7 (combine 25-7)

$p^{2}$ + 18

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The difference between the roots of the equation 2x^2−5x+c=0 is 0.25. Find c.

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Answer:

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Step-by-step explanation:

The given quadratic equation is $2x^2-5x+c=0$ .

Comparing this equation to: $ax^2+bx+c=0$ , we have a=2,b=-5.

Where: $x_1+x_2=\frac{5}{2}$ and $x_1x_2=\frac{c}{2}$

The difference in roots is given by:

$x_2-x_1=\sqrt{(x_1+x_2)^2-4x_1x_2}$

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$\implies 0.25^2=6.25-2c$

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$\implies -6.1875=-2c$

Divide both sides by -2

$c=\frac{99}{32}$

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4 years ago

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6) Sara has a loan for $1800 at a rate of 16% annually. How much interest will she pay in 4 years?

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