Answer:
it would be C.
Step-by-step explanation:
The brick will fall to the ground after 9 secs.
<h3>What are quadratic equations?</h3>
Given the equation for height as a function of time is h(t) = -16t2 + 1,296
The height of the brick on the ground is h(t) = 0. Substitute h(t) = 0 into the equation as shown:
Subtract 1296 from both sides
-16t² + 1,296 - 1296 = 0 - 1296
16t² = 1296
t² = 1296/16
t² = 81
t = 9secs
Hence the brick will fall to the ground after 9 secs.
Learn more on equations here: brainly.com/question/13763238
Answer:
1. x=-9-7y
2. x = 120
Step-by-step explanation:
Answer:
-6
Step-by-step explanation:
You are finding the dot product of vectors <2, 4> and <1, -2>. Recall that the dot product is a SCALAR. In this case <2, 4> · <1, -2> = 2(1) + 4(-2)>, or
2 - 8, or -6.
