Can someone please go into detail on how they simplified this expression? Thanks!: 4a - (4a-3)=4a 1(4a 3) Identity property
4a -4a + 3 Distributive property
0 -3 Combine like terms.
3 simplify
I really don't get how they got plus 3
Thanks again!


Answer 1


Step-by-step explanation:

4a - (4a-3)

= 4a -1(4a - 3)

= 4a - 4a + 3    <--- Distributing the -1 over the parenthes

= 3       <---- ( as 4a - 4a = 0)

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Please help I'm really bad at math and I can't get a bad grade can someone help me please max points

Marcus likes Nike sneakers. He paid $195 for a sneaker that originally cost $245. What is the percent discount of his purchase?




Step-by-step explanation:

195 divided by 245 = 0.79 approximately


Always divide the small number by the big number for percentages

Good luck!

ASAP Find the slope of The ordered pairs (0,-17),(2,13)




Step-by-step explanation:


1 5

Step-by-step explanation:

The brain volumes ​(cm cubedcm3​) of 20 brains have a mean of 1189.81189.8 cm cubedcm3 and a standard deviation of 126.5126.5 cm cubedcm3. Use the given standard deviation and the range rule of thumb to identify the limits separating values that are significantly low or significantly high. For such​ data, would a brain volume of 1432.81432.8 cm cubedcm3 be significantly​ high?



Lower limit = 936.8

Upper limit = 1442.8            

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 1189.8 cube cm

Standard Deviation, σ = 126.5 cube cm

Range rule of thumb:

  • The range rule of thumb says that the range is four times the standard deviation.

\text{Range} = 4* 126.5 = 506

  • The range rule of thumb suggests that most values would be in the area covered by four standard deviations that is within two standard deviations above or below the mean.

Lower limit =

\mu - 2\sigma\n= 1189.8 - 2(126.5)\n = 936.8

Upper limit =

\mu + 2\sigma\n= 1189.8 + 2(126.5)\n = 1442.8

Thus, most values lie within (936.8,1442.8)

A brain volume of 1432.8 cube cm is not significantly high because it is less than the upper limit.

Explain how you get 608,149 to the nearest thousand place



Step-by-step explanation:


you go to thousands look next number left and round up or down and the rest after the thousands becomes zeros

Final answer:

608,149 rounded to the nearest thousand is 608,000. The process involved looking at the digit in the hundreds place, determining it was less than 5, and therefore replacing it and all numbers to its right with zeroes.


To round 608,149 to the nearest thousand, you need to look at the digit in the hundreds place. This is the 1 in 608,149. Because 1 is less than 5, you leave the number in the thousands place (the 8 in 608,149) as it is, and change all the numbers to its right (149) in the original number to zeros. So 608,149 rounded to the nearest thousand is 608,000.

Learn more about Rounding Numbers here:


For the equation y = 2x2 - 5x + 18, choose the correct
application of the quadratic formula.



Option (2)

Step-by-step explanation:

For a quadratic equation,

ax² + bx + c = 0

roots of this equation can be determined by using quadratic formula,

x = (-b\pm√(b^2-4ac))/(2a)

Comparing this quadratic equation with the given equation,

y = 2x² - 5x + 18 = 0

a = 2

b = (-5)

c = 18

By substituting these values in the given formula,

x = (5\pm√((-5)^2-4(2)(18)) )/(2(2))

Therefore, Option (2) will be the answer.

Which best describes how to find an equation of the line shown?A. The slope m is rise over run, so y over x =m. Solve for Y to get y=mx.

B. The slope m is run over rise, so x over y=m. Solve for x=ym.

C. The slope m is run over rise, so x over y=m. Solve for y to get y= x over m.

D. The slope m is rise over run, so x over y=m. Solve for x to get x=ym.




Step-by-step explanation:

m (slope) =  rise    =    y    =  y₁ - y₁

                   run           x        x₁ - x₁

to get y = mx

therefore, the answer to the question is :

A. The slope m is rise over run, so y over x =m.

    Solve for y to get y=mx.