Equation #1 - move 3b to the right side. Now you're left with a=3b + 4 plug in that for a in equation #2. Once you figure out a, plug a in to equation #1 and find b.
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10 miles = 16km
2.5 miles = 4km
answer = 20km
Answer:
<em>9.</em>
Step-by-step explanation:
3 * √)0^2 + 3^2)
= 3*3
= 9.
Answer:
b = -n/(2-S) -a
Step-by-step explanation:
S = n/2 (a+b)
divide both sides by (a+b)
S/(a+b) = n/2
flip the equation on the left (it is the same equation just negative)
-(a+b)/-S = n/2
divide both sides by -S
-a-b = n/(2-S)
add a to both sides
-b = n/(2-S) +a
flip the sign (multiply/divide by -1)
b = -n/(2-S) -a
Answer: The ball will hit the ground 4 seconds after being thrown.
Step-by-step explanation:
By definition, the ball hits the grounds when the height is zero.
Then, knowing that the Quadratic function that models that situation is:

You can make it equal to zero:

Now you can use the Quadratic formula:

In this case you can identify that:

Therefore, knowing these values, you can substitute them into the Quadratic formula and then evaluate, in order to find the solution:

Choose the positive solution.
Then, the ball will hit the ground 4 seconds after being thrown.