I need help asap ~ thanks

Question 1:
It costs $26 for two children and two adults.
Explanation:
c=child c=$5
c+$3=adult
2 children and 2 adults equation 4x5+6=26

Question 2:
Luis has $3.75 left.

Explanation:
Luis has: 3x5+10=$25
12.75+8.50=21.25

$25-$21.25=$3.75

Question 3:
It will take about 8 months for Alexandra to earn the money because she earns about $105 a month and because their isn’t an exact amount of months you round up so she will have earned it by 8 months and have a little left over.

Explanation: 125-20=105 per month
$800 divided by $105= 7.61 month which round up to 8 months.

Question 4:
B

Explanation: She works 2 hours every weekday and there are five weekdays in a week, 2+3=5 and that is how much she earns on the weekends and there are 5 weekdays so the answer is B.

Question 5:
He made his goal because 1620 calories is 380 calories less than 2000 calories.

Explanation:
310+200= 510= lunch

310+510+800= 1620 which is how much he ate in a day and 1620<2000

Hope this helps :}

The shelves will hold 270 books in total