Answer: $312.5
Step-by-step explanation:
Lily spent one-fifth of her salary on a pair of shoes and then got $90 as a birthday present from her mom and was left with $340. To calculate the amount Lily had at first goes thus:
Since Lily spent 1/5 on shoes, that means she had (1 - 1/5) = 4/5 left.
Let the amount she had at first be y.
(4/5 of y) + 90 = 340
(4/5 × y) + 90 = 340
0.8y + 90 = 340
0.8y = 340 - 90
0.8y = 250
Divide both side by 0.8
0.8y/0.8 = 250/0.8
y= 312.5
She had $312.5 at first.
For part B problem 1. It's telling you to add the numbers from the difference high row and if your answer is not an integer, what two integers is it between.
-7 + -7 + 2 + 5 + -3 + -2= -12
Then you do the same for problem 2 But this time with the difference low row
0 + -3 + -7 + -1 + 1 + 0= -10
now you determine if both answers are integers or not
Speed in miles per hour is calculated as:
distance (in miles) ÷ time (in hours)
So we have:
(3/4) ÷ (3/10) = (3×10)/(4×3) = 30/12 = 15/6 = 5/2 = 2.5
So his speed is 2.5 mph (miles per hour).
