-20nx^2-36x-15
There you go
Answer:
The sum of age of the two new boys = 56 years
Step-by-step explanation:
The average age of a group of 13 boys = 13
The sum of age of the 13 boys = 13 * 13 = 169
The average age of a group of 15 boys = 15
The sum of age of the 15 boys = 15 * 15 = 225
The sum of age of the two new boys = 225 - 169 = 56 years
Answer:
43.2
Step-by-step explanation:
First you take off 20% from $60, and get $48, but you would take 10% off and get 43.2.
Answer:
The correct option is 2
Step-by-step explanation:
the answer would be (1,-2) because you basically divide the coordinates by the scale factor, in this case 4.
PLEASE MARK ME AS BRAINLIEST
Solve the following system using elimination:
{7 x + 2 y = -19 | (equation 1)
{2 y - x = 21 | (equation 2)
Add 1/7 × (equation 1) to equation 2:
{7 x + 2 y = -19 | (equation 1)
{0 x+(16 y)/7 = 128/7 | (equation 2)
Multiply equation 2 by 7/16:
{7 x + 2 y = -19 | (equation 1)
{0 x+y = 8 | (equation 2)
Subtract 2 × (equation 2) from equation 1:
{7 x+0 y = -35 | (equation 1)
{0 x+y = 8 | (equation 2)
Divide equation 1 by 7:
{x+0 y = -5 | (equation 1)
{0 x+y = 8 | (equation 2)
Collect results:
Answer: {x = -5, y = 8