Answer:
A
12+7x=a
x=days
a=amount of money
B 12+7x=a
Step-by-step explanation:
7(18)=126
12+126=a
138=a
Step-by-step explanation:
$20/hr carpenter pay
$25/hr blacksmith pay
Let c = hours working carpentry
Let b = hours working as blacksmith
c + b = 30 {equation 1}
20c + 25b = 690 {equation 2}
In equation 1 solve for one variable in terms of the other.
c = 30-b
Substitute that into equation 2:
20(30-b) + 25b = 690
600 - 20b + 25b = 690
5b = 90
b = 90/5
b = 18 hours working as a blacksmith
c = 30-b = 30-18 = 12 hours as a carpenter
Answer:
12
Step-by-step explanation:
Listing the weeks he will attend each item
Class 4,8,12,16
Chess 2,4,6,8,10,12
Fencing 3,6,9,12
Starting today at week 0, he will attend all 3 again at week 12
Answer:
There are 36 possibilities per character (26 lower case letters + 10 numbers), so the total number of permutations are 36^4 = 1,679,616
Step-by-step explanation:
