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3 years ago

Can u please only answer b . i know the answer to a.

Mathematics

1 answer:

tigry1 [53]3 years ago

4 0

The weight of b boxes would be 60b.

In fact, a certain number of boxes will weight

$\underbrace{60+60+60+\ldots+60}_{\text{number of boxes}}$

This repeated sum of the same number is exactly what multiplication means and so if you sum 60 with itself b times, you'll end up with $60\times b$

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Can someone please help me with this question?

Bond [772]

First you divide them all by 7 to see which are greater than 19

28/7=4
84/7=12
35/7=5
105/7=15

even if you add 1 to them they all are still less than 19
so select them all

hope this helps! :)

6 0

3 years ago

Read 2 more answers

Complete the Square:<br> 5x^2+16x-40=8<br> (please show your steps)

Sav [38]

Answer:

Step-by-step explanation:

divide through by the coefficient of $x^{2}$

$\frac{5x^{2} }{5}$ + $\frac{16x}{5} + \frac{-40}{5} = \frac{8}{5}$

$x^{2} +\frac{16}{5}x -8 =\frac{8}{5}$

$x^{2} +\frac{16}{5} x = \frac{8}{5} +8$

$x^{2} + \frac{16}{5} x =\frac{48}{5}$

Add half of the square of the coefficient of x to both sides $(\frac{1}{2} X \frac{16}{5} ) ^{2}$

$x^{2} + \frac{16}{5}x + (\frac{1}{2} X \frac{16}{5} )^{2} =$ $\frac{48}{5} +(\frac{1}{2} X \frac{16}{5} )^{2}$

$x^{2} +\frac{16}{5} x +(\frac{16}{10}) ^{2} =\frac{48}{5} +\frac{64}{25}$

$(x +\frac{16}{10})^{2} =\frac{304}{25}$

$x +\frac{16}{10} =$ ± $\sqrt{\frac{304}{25} }$

$x = -\frac{16}{10}$ ± $\sqrt{\frac{304}{25} }$

$x=-\frac{16}{10} + \sqrt{\frac{304}{25} }$ or $-\frac{16}{10} - \sqrt{\frac{304}{25} }$

$x = 1.89$ or -5.09

5 0

3 years ago

"More than 60% of the students scored below the mean on the last test." Can this statement be true? Why or why not?

Lelu [443]

The mean is the average of a set of numbers.

So if the remaining 40% of students score 100 points, and the 60% score like 50 points, then the mean would still be 70 points because of the 40% of students that scored super high.

So yes, it can be true.

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4 years ago

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Please help me with this problem !!

Ket [755]

True, true, false, true, false

3 0

3 years ago

What are the x and y-intercepts of the line described by the equation?

padilas [110]

I think the answer will be x= 4.4 and y= 2 .

8 0

3 years ago