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3 years ago

6

Teresa placed parentheses in the expression below so that its value was greater than 80. Write the expression to show where Tere

sa might have placed the parentheses. 10.5 + 9.5 × 3 - 1 × 2.5

1 answer:

AlexFokin [52]3 years ago

4 0

The x shows how they are meeting with the things to be with

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3 years ago

A sequence of 7 numbers starts with 8. The second number in the sequence is unknown and may be positive or negative. The third t

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Answer:

4

Explanation:

$a_1=8,a_7=0$

Since the third term is the sum of the two previous terms

$a_3=a_2+a_1$

$a_7=a_6+a_5$

$a_7=a_5+a_4+a_4+a_3$

Continuing in like manner

$a_7=5a_3+3a_2$

Since $a_3=a_2+a_1$

$a_7=5(a_2+a_1+3a_2$

$a_7=5a_2+5a_1+3a_2$

$a_7=8a_2+5a_1$

Recall: $a_1=8,a_7=0$

$0=8a_2+5*8$

$8a_2=-40$

$a_2=-5$

The sequence is therefore:

8,-5,3,-2,1,-1,0

The sum of the seven numbers is 4.

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Step-by-step explanation:

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Answer:

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