Your friend incorrectly says the solution to the equation 11.2y - 7.4y=141.36 is y=7.6 what error did your friend make?

Mathematics

2 answers:

DerKrebs [107]3 years ago

6 0

The error is clearly choice B.

11.2y - 7.4y should be subtracted not added.

Answer: Choice B

cupoosta [38]3 years ago

5 0

Answer:

The answer will be B. Added 7.4yplus 11.2y

Step-by-step explanation:

Answer: Added 7.4 plus 11.2y

Hope this helps :)

You might be interested in

What is the volume of the cone

Umnica [9.8K]

Answer:

37.68

Step-by-step explanation:

use the formula pi(3.14)r^2 h/3

3 0

2 years ago

What is the following quotient? 2- 8sqr / 4+12 sqr

AlekseyPX

Answer: 130

Step-by-step explanation:

--> first solve sqr-->2-64/4+144

-->perform division next as per DMAS rule-->64÷4=16--> 2-16+144

--> now perform addition and subtraction-->2-16-14--> -14+144= 130

7 0

3 years ago

X = -2y + 300 3y = 800 - 4x

devlian [24]

Answer:

Step-by-step explanation:

$\left\{\begin{array}{ccc}x=-2y+300&(1)\\3y=800-4x&(2)\end{array}\right\\\\\text{Substitute (1) to (2):}\\\\3y=800-4(-2y+300)\qquad\text{use the distributive property:}\ a(b+c)=ab+ac\\\\3y=800+(-4)(-2y)+(-4)(300)\\\\3y=800+8y-1200\\\\3y=8y-400\qquad\text{subtract}\ 8y\ \text{from both sides}\\\\-5y=-400\qquad\text{divide both sides by (-5)}\\\\y=80\\\\\text{Put it to (1):}\\\\x=-2(80)+300\\\\x=-160+300\\\\x=140$