2(-2x+4)= -6x+12. ---> -4x+8= -6x+12 ---> combine like terms so +4x to -6x to get 8= -2x+12 ---> -12 on both sides to get -4= -2x --> divide both sides by -2 to get 2= x
Answer:
b) 609.3
Step-by-step explanation:
Just divide 2138.7 by 3.51 and you'll get the answer, also I got it correct
1. Since we have <span>two sides (AC and AB) and the included angle (60°), we are going to use the law of cosines to find the length of BC:
</span>
<span>
We can conclude that the length of the side BC is </span>
.
2. To find the area of triangle ABC we are going to use Heron's formula:
where
is the area of the triangle
is the semi-perimeter of the triangle
But first, we are going to find the semi-perimeter of our triangle using the formula:
We can infer for our triangle and from our previous calculation that
,
, and
. Lets replace those values to find the semi-perimeter of our triangle:
Finally, we can use Heron's formula to find the area of our triangle:
We can conclude that the area of our triangle is
10.42 square units.
Answer:
D. w < 3.3
Step-by-step explanation:
It cannot be A because a book is 2.3 pounds. (w > 2.3) it would be correct if it was (w ≥ 2.3)
It cannot be B because majority of the books has a greater mass than 2.4 pounds. (w < 2.4)
It cannot be C because all books have a lesser mass(or equal mass) than 3.2 pounds (w > 3.2)
It is D because W is less than 3.3 pounds ( w < 3.3)