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John must have at least 289 test points to pass his math class. He already has test scores of 72, 78, and 70. Which inequality will tell him at least how many more points he needs to pass the class?

A. [tex]72+78+70+x\ \textless \ 289[/tex]
B. [tex]72+78+70+x\ \textgreater \ 289[/tex]
C. [tex]72+78+70+x \leq 289[/tex]
D. [tex]72+78+70+x \geq 289[/tex]


Sagot :

Alright, let's break down the problem step-by-step.

1. Identify the scores John already has: John already has scores of 72, 78, and 70.

2. Calculate the total of these scores:
[tex]\[ 72 + 78 + 70 = 220 \][/tex]

3. Determine the minimum total score required to pass the class: John needs at least 289 points to pass.

4. Find out how many more points John needs to achieve the required score:
[tex]\[ \text{Points needed} = 289 - 220 = 69 \][/tex]

5. Form the inequality to represent the situation: We need to establish an inequality that represents the scenario where John needs `x` more points to reach or exceed the required 289 points.

Thus, the inequality would be:
[tex]\[ 220 + x \geq 289 \][/tex]

Now, let’s look at the options provided:

A. [tex]\( 72 + 78 + 70 + x < 289 \)[/tex] – This is incorrect because this inequality tells John he needs less than 289 points in total, which does not align with the requirement of at least 289 points.

B. [tex]\( 72 + 78 + 70 + x > 289 \)[/tex] – This is incorrect because it suggests John needs more than 289 points, which is not a necessity; he needs at least 289.

C. [tex]\( 72 + 78 + 70 + x \leq 289 \)[/tex] – This incorrect because it suggests the total score could be less than or equal to 289, failing to meet or exceed the requirement of at least 289 points.

D. [tex]\( 72 + 78 + 70 + x \geq 289 \)[/tex] – This is the correct inequality because it properly represents that John’s current scores plus the additional points he needs must be at least 289.

Therefore, the best answer is:
D. [tex]\( 72 + 78 + 70 + x \geq 289 \)[/tex]