Number 7 would be 9.7536 or rounding to the nearest tenth 9.8
Number 9 would be 18,700.8
Answer: (150x3)+((150/2)x5)=(450)+((75)x5)=450+375=825. You would have to pay $825.
160 is the answer if im right
In 9, the error is that the 276 should be the numerator, not the denominator, because in the proportion Elisa made, the number of students is the numerator and the number of teachers is the denominator.
3.7x-18=-4.3x-34
+34. +34
3.7x+16=-4.3x
-3.7x. -3.7x
16=-8x
/-8. /-8
-2=x