Question

Please help me ASAP, Please Help me. Dont just do it for the points.​

Answer 1

Answer:

The best estimate for the value of the given expression is -2 1/2. Correct: Second alternative

Explanation:

Estimate and Number Rounding

There are situations where numbers must be estimated according to certain rules. If we have a number and we need a good approximate to it, we can use rounding to the required number of decimals.

The question requires to find the best estimate for the operation:

$\displaystyle \left(\frac{34}{8}-\frac{16}{3}\right)-\frac{14}{9}$

We calculate the decimal value of the expression:

$\displaystyle \left(\frac{34}{8}-\frac{16}{3}\right)-\frac{14}{9}=(4.25-5.33)-1.56=-2.64$

The first alternative is incorrect. It's a good approximation because it's close to the number, but the next alternative is the closest of all choices.

The second alternative Is correct. The value of -2 1/2 is -2.5. The number -2.64 is closer to -2.5 than to -3 which is the alternative A.

The third alternative Is incorrect. 7 is a positive number and it's not even close to -2.64

The last alternative Is incorrect. 7 1/2 = 7.5 is a positive number and it's not even close to -2.64