13. 2 – (–8) + (–3) = A. 1 B. 12 C. 7 D. 14
2 answers:
ANSWER
C. 7
EXPLANATION
We want to evaluate
We use the order of operations PEDMAS.
Dealing with the parenthesis first,we have
Note that:
and
Our expression now becomes:
Next, we add to get:
We finally subtract to get,
The correct answer is C
<h2>Hello!</h2>
The answer is: C. 7
<h2>Why?</h2>To solve the problem, first, we need to consider the signs out and inside of the parenthesis.
We must remember the following rule:
We are given the following expression:
Then, we can rewrite it using the rule of the signs, we have:
Hence, the correct option is C. 7.
Have a nice day!
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Answer:
After 2 seconds
Step-by-step explanation:
First step is find an equation of velocity:
h(t)=-16t2+64t+112. The velocity function is derivated from position function, so we should do that.
v(t)= h´(t)= -16*2*t+64 ⇒ v(t)= -32t+64.
Now we know the arrow reach the maximun height when this velocity is equal to zero when t>0.
0=-32t+64 ⇒ 32t=64, split each member for 32 ⇒ =
t=2. That means after 2 sec. the arrow reach the maximum height