Answer:
C. The damage to all living things caused by insecticides
Explanation:
Late in the 1950s, Carson turned her attention to conservation problems, the ones that she believed were caused by synthetic pesticides. In 1962, she wrote a book about her findings titled "Silent Spring", which brought environmental concerns to the American limelight. Silent Spring was met with fierce opposition by chemical companies, but it still went on to spurr a reversal in national pesticide policy, which led to a nationwide ban on DDT and other pesticides. And it also inspired a grassroots environmental movement that led to the creation of the U.S. Environmental Protection Agency.
In 1873, San Francisco introduced the cable car system. This mode of transportation was invented by Andrew Smith Hallidie. He was inspired to build this system as a result of a bad accident. A street carriage slid backwards, killing the horses pulling it. He was shocked and decided to do something about it by designing a different form of transportation that would prevent something like that from happening again.
Hi, thank you for posting your question here at Brainly.
All you have to do is add all the angles and equate to the total sum of angles for a quadrilateral.
360 = Angle Q + Angle P + Angle R + Angle S
Other relationships/equations are:
Q = 2P
R = 3b-19
S = 3b+10
Then, substituting...
360 = 2P + P + 3b - 19 + 3b + 10
360 = 3P +6b - 9
360 - 3P + 9 = 6b
6b = 369 - 3P
b = (369 - 3P)/6
b = 61.5 - 0.5P
Once you know the value of P, then you can determine the exact value of b.
