Write a proportion to find how many points x a student needs to score on a test worth 50 points to get a test score of 40%.

20 pts

Step-by-step explanation:

50 points corresponds to a 100% grade.  How many points (x) correspond to a 40% grade?

     x            40%

=

50 pts       100%

Then 100x = 2000, and so x = 20.

A score of 20 points would correspond with a test score of 40%.  

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629

im guessing (23,14). hope this : )