Answer:
-6
Step-by-step explanation:
-9x-27=27
-9x=27+27
-9x=54
x=54/-9
x=-6
(65+84+x)/3≥80
(149+x)/3≥80
149+x≥240
x≥91
Leon needs to score at least 91 at his next test
Answer:
t² + t - 3 = 0
Step-by-step explanation:
C = t - 5
B = t² - 2
2C + 2B
= 2(t - 5) + 2(t² + 2)
= 2t - 10 + 2t² + 4
= 2t² + 2t - 6
=> t² + t - 3 = 0