Helppppp meee ill promise toooo markkk brainliestttttttt

Mathematics

1 answer:

statuscvo [17]3 years ago

4 0

T=3; it takes 3 seconds to reach the max height and 3 seconds to fall back to the ground.

You might be interested in

If using the method of completing the square to solve the quadratic equation x^2 + 3x +21 =0?

goldfiish [28.3K]

Answer:

$x= \dfrac 12 \left( -3 +i5\sqrt 3\right)\\\\x= \dfrac 12 \left( -3 -i5\sqrt 3\right)$

Step-by-step explanation:

$~~~~~~x^2 +3x +21 = 0\\\\\implies x^2 +3x = -21\\\\\implies x^2 + 2\cdot \dfrac 32 \cdot x + \left( \dfrac 32 \right)^2 = -21 + \left( \dfrac 32 \right)^2\\\\\implies \left(x + \dfrac 32 \right)^2 = -21+\dfrac 94\\\\\implies \left(x + \dfrac 32 \right)^2 = -\dfrac{75}4\\\\\implies x+ \dfrac 32 = \pm\sqrt{-\dfrac{75}4 \right)\\\\\implies x + \dfrac 32 = \pm i \dfrac{5\sqrt 3}{2}\\\\\implies x = -\dfrac 32 \pm i \dfrac {5\sqrt 3}2\\\\\implies x = \dfrac 12 \left( -3 \pm i5\sqrt 3\right)$

8 0

2 years ago

Sarah pays a 20% deposit for a new TV and then an extra $96. What’s the total cost?

mixer [17]

A deposit (in this case) is a portion of the TV paid in advance - 20% of the total cost. That means that the 96$ makes up the remaining 80% of the total cost, which I'll represent as x. From here, we can set up an equation to find the total cost x, since we have a relation to form it on - the fact that 80% of x is equal to 96$.

$0.8x = 96$