A= 3400t + 600 | given formula
21000= 3400t + 600 | substitute the altitude into the formula
20400 = 3400 | subtract 600 from both sides
6 = t | divide both sides by 3400
6 minutes
Answer:
[-4,2] or ![-4 \leq x \leq 2](https://tex.z-dn.net/?f=-4%20%5Cleq%20x%20%5Cleq%202)
Step-by-step explanation:
Range is the range of the y-axis.
Although we see that the "line" ends at a specific point, it is neither the highest or lowest y-value.
Our lowest y value is -4, and because it is a line, it is not an open dot resulting in a [, instead of a (.
This same thing happens with highest y-value which happens to be 2.
This is interval notation.
Due to your question, you may be asking for this:
![-4 \leq x \leq 2](https://tex.z-dn.net/?f=-4%20%5Cleq%20x%20%5Cleq%202)
Well. The formula for the area of a trapezoid is b1 + b2 over 2 times h.
a = b1 + b2 (h)
--------------------
2
3.9 = 4+2.5 (h)
--------------------
<span> 2</span>
3.9 = 6.5(h)
----
2
height = 1.2 cm.
You can use the Pythagorean Theorem:
a^2+b^2=c^2
x^2+x^2=(7√2)^2
2x^2=49*2 (combine like terms and square the 7√2)
x^2=49 (divide both sides by 2)
x=7 (square root both sides)
So the equation is 2x^2=98 (simplest form) and x=7
Hope this helps