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3 years ago

HELP

Mathematics

1 answer:

Shtirlitz [24]3 years ago

4 0

x(x + 9-x) = 6^2

9x = 36

x = 4

Answer

c. 4

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Please help with this

kotykmax [81]

Answer:

A. x = 5, -3

Step-by-step explanation:

The quadratic equation/formula is:

$x = \frac{-b+- \sqrt{b^2 - 4ac} }{2a}$

The setup is:

$ax^2+bx+c=0$

$4x^2 - 8x -60=0$

Plug in the numbers according to the letter associated:

$x = \frac{8+-\sqrt{-8^2-4(4)(-60)} }{2(4)}$

$x = \frac{8+-\sqrt{1024} }{8}$

$x = \frac{8+-32}{8}$

Solve for addition and subtraction:

$x = \frac{8+32}{8}$ $x = \frac{8-32}{8}$

$x = \frac{40}{8}$ $x = \frac{-24}{8}$

x = 5 x = -3

4 0

3 years ago

Danielle has taken five math tests so far this year. The tests are out of twenty points, and she has gotten the following scores

vodka [1.7K]

The median of her scores would be 17

8 0

2 years ago

Read 2 more answers

(a) Find the slope of the curve y= x^2 - 2x - 3 at the point P(2, -3) by finding the limit of the secant slopes through point

gayaneshka [121]

Answer:

Step-by-step explanation:

P=(2,-3)

Q=(a,a²-2a-3)

$\Delta y=a^2-2a-3-(-3)=a^2-2a\\\Delta x=a-2\\\\\displaystyle \lim_{a \to 2} \dfrac{a^2-2a-3-(-3)}{a-2} \\\\=\lim_{a \to 2} \dfrac{a^2-2a}{a-2} \\\\=\lim_{a \to 2} \dfrac{a(a-2)}{a-2} \\\\=\lim_{a \to 2} \dfrac{a}{1} \\\\=\lim_{a \to 2} a \\\\=2\\$

Proof:

y'=(x²-2x-3)'=2x-2

y'(2)=2*2-2=2

7 0

3 years ago

What is 9.45 rounded to the nearest whole number?

Montano1993 [528]

Answer:

Step-by-step explanation:

9.45 is rounded down to 9 because the number must reach half to round up. To round up to 10, it must be 9.5. hope this helps

5 0

3 years ago

Read 2 more answers

Which ordered pairs (x,y) are solutions to the linear equation 2x+3y=6

Nuetrik [128]

Answer:

I think it is 0,2

Step-by-step explanation:

Because you need to substitute the ordered pairs into the linear equation:

so,

2(0)+3(2) = 6

6=6

The two side, so equation are identical, so the correct answer is (0,2).

I hope this helps!

8 0

3 years ago

Read 2 more answers