4. Kelvin and Marsha are going to dinner and a movie this evening. Kelvin wants to have at least
$70 cash in his wallet. He currently has $10. How much money, x, does Kelvin need to
withdraw from the bank?
a) x + 10 > 70; x > $60
b) x + 10 ≥ 70; x ≥ $60
c) x + 10 < 70; x < $60
d) x + 10 ≤ 70; x ≤ $60
To determine how much money Kelvin needs to withdraw from the bank, we can set up an inequality.
Let's denote x as the amount of money Kelvin needs to withdraw.
We know that Kelvin currently has $10 and he wants to have at least $70 in his wallet.
So, we can write the inequality as follows:
x + 10 ≥ 70
This inequality states that the amount of money Kelvin needs to withdraw, x, plus the $10 he already has must be greater than or equal to $70.
Therefore, the correct answer is:
b) x + 10 ≥ 70; x ≥ $60
To solve this problem, we need to find the value of "x" which represents the amount of money Kelvin needs to withdraw from the bank.
We know that Kelvin wants to have at least $70 cash in his wallet and he currently has $10. So, the total amount of money in Kelvin's wallet after he withdraws cash from the bank would be x + 10 dollars.
From the given information, we can form the following inequality:
x + 10 ≥ 70
Let's break down this inequality:
- The "≥" symbol means "greater than or equal to." It indicates that the total amount of money Kelvin has after withdrawing from the bank (x + 10) should be greater than or equal to $70.
- The expression "x + 10" represents the total amount of money in Kelvin's wallet after withdrawing from the bank.
- "70" represents the minimum amount of money Kelvin wants to have in his wallet.
Simplifying the inequality, we have:
x ≥ 60
So, the correct option is:
b) x + 10 ≥ 70; x ≥ $60
"at least" means ≥
If he withdraws x, he will have 10+x
so, what do you think?