Answer:
-23
Step-by-step explanation:
The discriminant is the number inside of the radical of the quadratic formula.
18.6?......if it is rounded to 18.6, the digit in the ones place would have to be 18.55 thru 18.59...the lowest being 18.55 and the highest being 18.59.
Reasoning : 18.59.....when rounded to the nearest tenths....u look at ur number in the tenths place, it is 5....now look at ur number to the right of it...if that number is 5 or above, u round the 5 to a 6...but if that number is 4 or below, the number would remain a 5.
Examples :
18.55 rounded to the nearest tenths = 18.6 (because the number to the right of 5 is 5, so we round up to 18.6
18.54 rounded to the nearest tenths = 18.5(because the number to the right of the 5 is 4....so we round it to 18.5
Hey there,
Lets solve this together, my friend
Divide both sides by <span>−2
</span>
Simplify <span>10 /−2</span> to <span>−<span>10 / 2
</span></span>
Simplify 10 / 2 to <span>5
</span>
<span>
-------- Check your work
</span>
Let <span>c=−5
</span>
Simplify <span><span>2×−5</span></span><span> to </span><span><span>−10
</span></span>
<span><span>
Therefore, the answer is correct!</span></span>
Answer:
Unobserved effect.
Step-by-step explanation:
The unobserved effect of heterogeneity is correlated with the observed explanatory variables. Population heterogeneity is bias in unobserved pre treatment factors which affect the outcome even without treatment.
Answer: the rate of the westbound train is 85 mph.
Step-by-step explanation:
Let x represent the rate of the westbound train. The westbound train travels 10 miles per hour slower than the eastbound train. It means that the rate of the eastbound train is (x + 10) mph.
The two trains leave the station at the same time. The total distance covered by both trains after 3 hours is 540 miles.
Distance = speed × time
Distance covered by the westbound train in 3 hours is 3x.
Distance covered by the eastbound train in 3 hours is 3(x + 10)
Therefore,
3x + 3(x + 10) = 540
3x + 3x + 30 = 540
6x = 540 - 30 = 510
x = 510/6 = 85 mph
