Let x be the score Amaya gets on the final test. She wants her average of all 3 tests to be between 80 and 89:
<span>80 ≤ (78 + 91 + x) / 3 ≤ 89 </span>
<span>Multiply everything by 3: </span>
<span>240 ≤ 78 + 91 + x ≤ 267 </span>
<span>240 ≤ 169 + x ≤ 267 </span>
<span>Subtract 169 from everything: </span>
<span>240 - 169 ≤ x ≤ 267 - 169 </span>
<span>71 ≤ x ≤ 98 </span>
<span>Answer: </span>
<span>She needs to score between 71 and 98 to get a B for the course.</span>
It’s definitely A
Ex: f(x)=8x+2
f(x)=8(-4)+2
f(x)=-32+2
f(x)=-30
Based on the given conditional statement, the biconditional statement would be The sum of two angles is 180° if and only if the angles are supplementary.
<h3>What is the biconditional statement?</h3>
A biconditional statement takes a conditional statement and restates it while also stating its converse.
To do so, it will often use the words, "if and only if" to emphasize the condition required.
The biconditional statement here is therefore:
" The sum of two angles is 180° if and only if the angles are supplementary."
Find out more on biconditional statements at brainly.com/question/24528571
#SPJ1
Unit rate means a fraction where the denominator is one. To get this, simply divide 117 by 6.5 seconds. So, the elevator can travel 18 feet in 1 second. (Remember to write answer as a fraction :D) hopefully I helped!!