Answer:375 hours total...............
Step-by-step explanation:
The average of anything can be calculated by adding up all the terms and dividing by the number of terms.
In this case,
the number of terms = 3
x = the missing test score.
(91 + 72 + x) / 3 = 80
Let's multiply both sides by 3
91 + 72 + x = 240
Combine like terms.
163 + x = 240
Subtract 163 from both sides
x = 77
Carlos scored a 77 on his third test.
<span>x^2-5x-24=0
x=<span><span><span>−b</span>±<span><span>b2</span>−<span><span>4a</span>c</span></span></span><span>2a</span></span></span><span>x=<span><span><span>−<span>(<span>−5</span>)</span></span>±<span><span><span>(<span>−5</span>)</span>2</span>−<span><span>4<span>(1)</span></span><span>(<span>−24</span>)</span></span></span></span><span>2<span>(1)</span></span></span></span><span>x=<span><span>5±121</span>2
</span></span><span><span>x=<span><span>8 <span>or </span></span>x</span></span>=<span>−3
<span><span>
</span></span></span></span>
Answer:
824.05
Step-by-step explanation:
the hundreths place is two spots behind the decimal, there is a four. Look at the number next to it is a 7 so you round up
