Answer:
2.05hrs
Step-by-step explanation:
Given he total cost c(x) of hiring a dump truck and an operator is described by the function c(x)=300+31x-3.90x^2 , where x is the number of hours worked. If c(x)=$220, then;
220 = 300+31x-3.90x^2
300+31x-3.90x^2 - 220 = 0
3.90x^2 + 31x - 80 = 0
x = -31±√31²-4(-80)(3.9)/2(3.9)
x = -31±√961+1.248/7.8
x = -31±47/7.8
x = -31+47/7.8
x = 16/7.8
x = 2.05
hence the number of working hours is 2.05hrs
Writing an email to a friend asking for help regarding English speaking skills.
An email is an electronic network of sending messages to another person through the use of the internet. It is another form of instant messaging that enables a person to receive the message immediately.
- The sample for writing an email to a friend asking for help in English speaking skills is as below-
- First, we include the email address of the sender and the receiver.
- Considering your fluency in speaking in English, I need your help. Can you please suggest ways for me to improve my English speaking skills? I can't use English properly both in speaking and writing. I hope you can guide me to improve my speaking skill. Looking forward to hearing from you.
Email can be of two types, <u>formal and informal</u>. As this required email is to a friend, we do not need to use formal language and can openly use informal words.
Learn more about email writing here:
brainly.com/question/17332088
Answer:
{(2,3), (3,4), (5,1), (6,2), (7,3)}
Step-by-step explanation:
Answer:
$12,000
Step-by-step explanation:
100 x 12.
1200 x 10.
= 12000