7x+5y=-24 (1)
4x+y=42 (2)
multiply equation (2) by 5 to get
20x+5y=210 (3)
then calculate (3)-(2) which gives you
13x=234 hence x=18
then substitute for x in either equation to get y=-30
Answer: 4.5 hours
<u>Step-by-step explanation:</u>


Answer:
8.80
Step-by-step explanation:
(S. D.)^2=summation(x-mean)^2/(n-1)
S. D.=sqrt(388/5)
S. D.=8.80
Answer:
6
Step-by-step explanation:
Its 6 or 4, but leaning toward 6
Answer:
$320 if your saying how much in all its basically 8 times 4 add a zero to the end
Step-by-step explanation: