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3 years ago

In the equation 6x-2 = -4x + 2, Spencer claims that the

Mathematics

2 answers:

kenny6666 [7]3 years ago

7 0

Both Spencer and Jeremiah are correct, because either can be done to make the x’s on one side only.

kifflom [539]3 years ago

4 0

Answer:

Sample Response: Both are correct. As long as inverse operations and the properties of equality are used properly, both methods will generate the same solution. They both isolate the variable on one side of the equation.

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Help!! on question 13, solve each equation for x.

GaryK [48]

Square root of x^2 is x
square root of 144 is 12
(x-12) (x+12)
x=12 or x= -12

5 0

3 years ago

67 times a number minus 65 is equal to -4 less than the number

sashaice [31]

Answer:

Translation is 67x-65=x-4, you can use any variable for the number.

Step-by-step explanation:

7 0

2 years ago

An object is launched from ground level with an initial velocity of 120 meters per second. For how long is the object at or abov

babunello [35]

Answer:

D) 14 seconds

Step-by-step explanation:

First we will plug 500 in for y:

500 = -4.9t² + 120t

We want to set this equal to 0 in order to solve it; to do this, subtract 500 from each side:

500-500 = -4.9t² + 120t - 500

0 = -4.9t²+120t-500

Our values for a, b and c are:

a = -4.9; b = 120; c = -500

We will use the quadratic formula to solve this. This will give us the two times that the object is at exactly 500 meters. The difference between these two times will tell us when the object is at or above 500 meters.

The quadratic formula is:

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

Using our values for a, b and c,

$x=\frac{-120\pm \sqrt{120^2-4(-4.9)(-500)}}{2(-4.9)}\\\\=\frac{-120\pm \sqrt{14400-9800}}{-9.8}\\\\=\frac{-120\pm \sqrt{4600}}{-9.8}\\\\=\frac{-120\pm 67.8233}{-9.8}\\\\=\frac{-120+67.8233}{-9.8}\text{ or }\frac{-120-67.8233}{-9.8}\\\\=\frac{-57.1767}{-9.8}\text{ or }\frac{-187.8233}{-9.8}\\\\=5.3242\text{ or }19.1656$

The two times the object is at exactly 500 meters above the ground are at 5 seconds and 19 seconds. This means the amount of time it is at or above 500 meters is

19-5 = 14 seconds.

6 0

3 years ago

Identify the exponential function for this graph. (Be sure to look at the scales

Mice21 [21]

Answer: Hey the answer is f(x)=4•(0.5)^x

Step-by-step explanation:

3 0

3 years ago

Timed quiz help please! <br> 2 2/5 kilometers in 3 3/4 minuets.

shepuryov [24]

Answer: 16/25 (sorry I'm not really sure bc I'm just a middle schooler)

Step-by-Step explanation:

2 2/5 km=2.4 kilometers

3 3/4 minutes=3.75 minutes

2.4/3.75=240/375

240/375=48/75=16/25=64/100=0.64

0.64 km/minute (0.64 km per minute)

you can solve the problem using the fractions...

2 2/5=12/5

3 3/4=15/4

(12/5)/(15/4)=(12/5)*(4/15)=48/75=16/25=0.64 again, or you can simplify before multiplying...

(12/5)/(15/4)=(12/5)*(4/15)=(4/5)*(4/5)=16/25...

4 0

3 years ago