A) get rid of the parenthesis 4(5n-7) = 20n-28,

so 20n-28=10n+3===>transpose 10n from the left to the right it becomes -10n & transpose -28 from the left to the right it becomes +28

10n=31 & n=31/10 ==> n=3.1

7 0

4 years ago

(-3,-5) (2,5) Midpoint

BabaBlast [244]

Answer:

$\left(-\frac{1}{2},\:0\right)$

Step-by-step explanation:

$\mathrm{Midpoint\:of\:}\left(x_1,\:y_1\right),\:\left(x_2,\:y_2\right):\quad \left(\frac{x_2+x_1}{2},\:\:\frac{y_2+y_1}{2}\right)\\\\\left(x_1,\:y_1\right)=\left(-3,\:-5\right),\:\left(x_2,\:y_2\right)=\left(2,\:5\right)$

$\left(x_1,\:y_1\right)=\left(-3,\:-5\right),\:\left(x_2,\:y_2\right)=\left(2,\:5\right)\\\\Refine$

$=\left(-\frac{1}{2},\:0\right)$

4 0

3 years ago

The length of a rectangle is 4m longer than its width.

FromTheMoon [43]

Call the length a, the width b

Perimeter = (a+b) x 2

We have : a - b = 4 and (a+b) x 2 = 56

-> a + b = 28
-> a - b = 4

=> a+b + (a-b) = 32
2a = 32
a = 16
b = 56:2-16 = 12

So, the length = 16 and the width = 12

8 0

3 years ago