MATHEMATICS HIGH SCHOOL

Simplify. (-5.12) - (-4.7) + (7.021) 6.79 6.601 -2.799

Answers

Answer 1
Answer: Simplify. (-5.12) - (-4.7) + (7.021) 6.79 6.601 -2.799
Answer 2
Answer:

Answer:

well, the other answer is wrong. the solution you want is 6.601

Step-by-step explanation:

use symbolab.com

get easy math help at www.symbolab.com

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Write a multiplication equation that represents the question: how many 3/8 s are in 5/4 ? y'all help mee

Answers

Answer:1/4

Step-by-step explanation:

Solve the following system.
x^2 + y^2 = 25
2x + y = 10
The solution set

Answers

\begin{cases} x^(2)+y^(2)=25 \n 2x+y=10 \end{cases} \n \n \begin{cases} x^(2)+y^(2)=25 \n y=10 -2x\end{cases} \n \n \begin{cases} x^(2)+(10-2x)^(2)=25 \ny=10-2x \end{cases} \n \n \begin{cases} x^(2)+100-40x+4x^(2)=25 \ny=10-2x \end{cases} \n \n \begin{cases} 5x^(2)-40x+75=0 \ny=10-2x \end{cases}

\begin{cases} x^(2)-8x+15=0 \ny=10-2x \end{cases} \n \n \begin{cases} \Delta=(-8)^(2)-4*1*15=64-60=4; \ \ \ √(\Delta) =2 \ny=10-2x \end{cases} \n \n \begin{cases} x_(1)= (8-2)/(2) =3 \ \wedge \ x_(2)= (8+2)/(2)=5 \ny=10-2*3=4 \ \wedge \ y=10-2*5=0 \end{cases}

If sin of beta = 4/7, what is cos of beta?

Answers

sin²β +cos²β=1
cos²β=1-sin²β 
cos²β=1-(4/7)²
cos²β=1-16/49=49/49-16/49=33/49
cosβ=√33/√49=√33/7

the sides of a triangle have lengths of x, x+5, and 25. if the longest side is 25, which of the following values of x would make the right triangle?

Answers

x^2+5x-300=0 \n \n \Delta =b^2-4ac =5^2 -4*1* (- 300)= 25+1200=1225 \n \nx_(1)=(-b- √(\Delta ) )/(2a)=(-5- √(1225))/(2 )=(-5-35)/(2)=-(-40)/(2)=-20 \n\n \ side \ not \ can \ also \ be \ negative

x_(2)=(-b+ √(\Delta ) )/(2a)=(-5+ √(1225))/(2 )=(-5+35)/(2)=-(30)/(2)=15\n \nAnsewr : \ x= 15




 

Darcy deposited $390 into a savings account. As long as the account balance remains at or above $150, she does not have to pay a service fee for the account. For how many months can she withdraw $40 a month without having to pay service fees? A) 3 B) 5 C) 6 D) 9

Answers

Answer:

C. 6

Step-by-step explanation:

Answer: C) 6

Step-by-step explanation: usatestprep approved

Lee had a total of 40 e-mails on Monday. Twelve of the e-mails were from her friend Cara. What percent of the e-mails were from Cara?

Answers

❅ We can look at this question as what is 12% of 40.
❅ Lets lookat it like this: Y is 12% of 40
❅ We are going to do y=12%*40

❅ Now convert the answer you get into a decimal.
❅ 12%/100 = 0.12
❅ Now once again, solve: 0.12 * 40
❅ and then you get 4.8
❅4.8 is 12% of 40.
 Now to get the number of percent
Divide: 12/40=.3

And you get: .3=30%
So Carla was 30% of her emails.
And 4.8 is 12% of 40.
❅Hope this helps!❅
To find the percentage we divide the number of emails from Cara by the total number of emails.

12/40=.3

.3=30%

30% of the emails were from Cara
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