Answer:
A
Step-by-step explanation:
the standard form of a quadratic equation is
ax² + bx + c = 0 : a ≠ 0
obtain (5 + x)(5 - x) = 7 in this form by expanding the factors
25 - x ² = 7 ( subtract 7 from both sides )
18 - x² = 0 ( multiply through by - 1 )
x² - 18 = 0 ← in standard form
with a = 1, b= 0 and c = - 18 → A
Answer:
C
Step-by-step explanation:
3a-7=-4b+1
3a-8=4b
(3a/4)-2=b
1. 5
2. 5
3. 10
4. 25
5. -11
6.1/4
7. 1
8. -1
89+92+95=276
360-276
84
David needs at least an 84 to get an A in the Economics course.
