Let the smaller number be n:
Therefore 1/2 * n(n+1) = 105
n^2 + n = 210
n^2 + n - 210 =0
Use your preferred method to solve the quadratic, I'll factorise this since this is easy to factorise.
Two numbers':
product gives -210
summation gives 1
Therefore (n+15)(n-14)=0
So the smaller number n is either -15 or 14.
Answer: 4
<u>Step-by-step explanation:</u>
Melinda: y = 10x + 22
George: y = 13x + 10
13x + 10 = 10x + 22
<u>-10x </u> <u>-10x </u>
3x + 10 = 22
<u> -10 </u> <u> -10 </u>
3x = 12
<u>÷3 </u> <u> ÷3 </u>
x = 4
Answer:
January has the greater MAD.
Step-by-step explanation:
The MAD of January is 8. You can figure this out by finding the mean of the data (adding them all together then dividing by the number of data points), then finding the distance between each data point and the mean. You then will add all the distances together, then divide by the number of data points. The MAD of July is 2.5. See above for the process.
2x² + 3x - 5 = 0
a=2, b=3, c=-5
D = b² - 4ac = 3² - 4*2*(-5) = 9 + 40 = 49
Answer:
i got 48
Step-by-step explanation:
2(5*2)
2(2*5)
2(2*2)
