She received 12 calls from her son and 30 calls in total.
40% of 30 is 12.
To do that we have to add 2+7=9
Next step is to divide 72 by 9
72:9=8 - its how many pounds its in"1"
Finally we can multiply
2*8=16
7*8=56 - its the answer

Step-by-step explanation:
yes
Answer:
± 5
Step-by-step explanation:
2x/-5 = -10/x
2x^2 = 50
x^2 = 25
x = ± 5
Answer: 1. 2nd endpoint (24,-18) 2. 2nd endpoint: (-19,4)
Step-by-step explanation:
1.
= 7 x = 24
= -6 y= -18
2nd endpoint: (24,-18)
2.
= -10 x= -19
= 2 y= 4