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3 years ago

I NEED HELP ASAP DUE TOMORROW AT 9:00 AM

Mathematics

1 answer:

Ludmilka [50]3 years ago

7 0

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7x^2=9+x what are the values of x Will give medal and points

DENIUS [597]

7x² = 9 + x Subtract x from both sides
7x² - x = 9 Subtract 9 from both sides
7x² - x - 9 = 0 Use the Quadratic Formula

a = 7 , b = -1 , c = -9

x = $\frac{-b \pm \sqrt{b^2 - 4ac} }{2a}$ Plug in the a, b, and c values
x = $\frac{- (-1) \pm \sqrt{(-1)^2 - 4(7)(-9)} }{2(7)}$ Cancel out the double negative
x = $\frac{1 \pm \sqrt{(-1)^2 - 4(7)(-9)} }{2(7)}$ Square -1
x = $\frac{1 \pm \sqrt{1 - 4(7)(-9)} }{2(7)}$ Multiply 7 and -9
x = $\frac{1 \pm \sqrt{1 - 4(-63} }{2(7)}$ Multiply -4 and -63
x = $\frac{1 \pm \sqrt{1 + 252} }{2(7)}$ Multiply 2 and 7
x = $\frac{1 \pm \sqrt{1 + 252} }{14}$ Add 1 and 252
x = $\frac{1 \pm \sqrt{253} }{14}$ Split up the $\pm$
x = $\left \{ {{ \frac{1 + \sqrt{253} }{14} } \atop { \frac{1 - \sqrt{253} }{14} }} \right.$
The approximate square root of 253 is 15.905973.
x ≈ $\left \{ { \frac{1 + 15.905973}{14} } \atop { \frac{1 - 15.905973}{14} }} \right$ Add and subtract
x ≈ $\left \{ {{ \frac{16.905973}{14} } \atop { \frac{14.905973}{14} }} \right.$ Divide
x ≈ $\left \{ {{1.2075} \atop {1.0647}} \right.$ Round to the nearest hundredth
x ≈ $\left \{ {{1.21} \atop {1.06}} \right.$

7 0

3 years ago

The table below shows the amount of a radioactive compound remaining after X years Sarah is compiling the data into a lab report

Murrr4er [49]

Answer:

A. the y-intercept of the graph is 900, and as X increases, f(x) approaches 100.

Step-by-step explanation:

The table can be described by the function ...

f(x) = 100 +800·2^-x

This is an exponential decay (not a constant-rate decay) from a y-intercept of 900 down to a minimum value of 100 (not zero).

The best description is that of choice A.

9 0

3 years ago

What is the value of y in the equation 3(3y – 12) = 0? (5 points)

natta225 [31]

Set equal to 0

3=0, nope

3y-12=0
add 12
3y=12
divide 3
y=4

5p-4p-8=-2+3
p-8=1
p=9
1 solution

6 0

3 years ago

Read 2 more answers

Exam pls help 34 points

FrozenT [24]

Answer:

it would be 4/20 I thinkk

Step-by-step explanation:

4 0

3 years ago

PLEASE HURRRYY!!! I need help

VashaNatasha [74]

Answer:

C) 8 ft

Step-by-step explanation:

you use the pythagorean theorem to find the height.

a² + b² = c²

a = radius

b = height

c = slant height

15² + h² = 17²

h = 8

3 0

3 years ago