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Verdich [7]
4 years ago
14

Identify the methods PLEASE HELP!!

Mathematics
2 answers:
Nostrana [21]4 years ago
8 0

Answer:

C and D

Step-by-step explanation:

You need to add the 2 equations together, so one equation must be negative and the other positive. You also need to make sure the coefficients to the variables are the same so you can eliminate them. Therefore, A and B are wrong and your correct choices are C and D.

klemol [59]4 years ago
6 0

Answer:

Letter A and B are the answers

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Please help me ASAP !!
Nadya [2.5K]

Answer:

Step-by-step explanation:

<1+<2=90 complementary

<1=4 times <2

X+4x=90

5x=90

X=18

<1=18×4=72 degrees

<2=18 degrees

<1=<3 because they are vertical

Do <3= 72

<3+<4=180 because they are supplementary

72+<4=180

<4=108 degrees

<3=72 degrees

4 0
3 years ago
What is the expression for the calculation double the product of 8 and 3
neonofarm [45]
(8*3)2 is correct answer for your question
3 0
3 years ago
Please help!!!!!!!!!!
Dmitriy789 [7]

Answer:

1. c.

2. a.

3. b.

Step-by-step explanation:

Remember f(x) = y

1. f(x) = y = 2/5x+8

2. f(x)= y - 8 = x => y = 8 +x

3. f(x) = y = x - 8

3 0
2 years ago
#10) Mrs. Sommer states that angle I is 65 degrees. Is she correct? why or why not​
Minchanka [31]

Answer: Mrs. Somner is correct.

Step-by-step explanation: In a triangle, the angles add up to 180 degrees. Since we know that Triangle ABC is equal to Triangle RST, we can assume that their angle values are equal as well. Angle A is 41 degrees, and Angle B is 74 degrees. This adds up to 115 degrees. If we subtract 115 from 180, we get 65. Therefore, Mrs. Somner is correct.

6 0
3 years ago
Can you explain step by step for #15 and #16 I have a test on this tomorrow
RUDIKE [14]

Answer:

15.

\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

16. 10 ml of 20% saline and 40 ml of 10% saline

Step-by-step explanation:

A chemist takes x ml of 20% saline and y ml of 10% saline. In total, he takes

x + y ml that is 50 ml, so

x + y = 50.

There are  0.2x ml of salt in x ml of 20% saline and 0.1y ml of salt in 10% saline. There are 0.12\cdot 50=6 ml of salt in 50 ml of 12% saline. Thus,

0.2x+0.1y=6

15. We get the system of two equations:

\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

16. Solve this system. From the first equation:

x=50-y

Substitute it into the second equation:

0.2(50-y)+0.1y=6\\ \\10-0.2y+0.1y=6\\ \\-0.1y=6-10\\ \\-0.1y=-4\\ \\y=40\\ \\x=50-y=50-40=10

7 0
3 years ago
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