1 ,3 and 4 are correct :)
Answer: (-2,5)
Step-by-step explanation: just graph both equations they are already set up in the form and find the point where they intersect
One way of doing it is by using the properties of summing things, like factoring out the minus sign:
<span><span>∑<span>n=2</span>8</span><span>−(n−5)</span>=−<span>∑<span>n=2</span>8</span><span>(n−5)
</span></span>
and splitting it up into two parts and again factor
<span>=−<span>(<span><span>∑<span>n=2</span>8</span><span>n−5<span>∑<span>n=2</span>8</span>1</span></span>)
</span></span>
The last sum is just counting how many numbers there are from 2 to 8, which is 7 (you can do it on your fingers). The first one can be calculated fast if we are clever and use this identity:
<span><span>∑<span>n=1</span>m</span>n=<span><span>m(m+1)</span>2
</span></span>
So what we get is
<span><span>=−<span>(<span>−1+<span><span>8(8+1)</span>2</span>−7</span>)</span>=8−72/2=8−36=−28.</span></span>
B. 67
C. 43
Answer!!!!!!!!!!!!!!!!!!!
Answer:
Part 1)
The equation by factorization is
Both values of x are
Part 2) The dimensions of the cuboid are
, 
and 
Step-by-step explanation:
step 1
we know that
The volume of the cuboid is equal to
substitute the given values
so
Complete the square
square root both sides
so
therefore
The equation by factorization is
step 2
Find the dimensions of the cuboid
The dimensions are
