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3 years ago

Which equation can be used to find the value of x?

Mathematics

1 answer:

Dafna11 [192]3 years ago

6 0

Answer:

Step-by-step explanation:

We know every triangle equals 180 so were just going to take 180 - 42 = 138 then were going to do 138 - 67 = 71 we can check our work by doing

42 + 67+ 71 = 180. We also know 67 + 42 = 109.

Lets look at our answers;

A. 109 = 180 + x When solved it gave me; x = -71. We got a positive 71 so this is incorrect.

B. x + 42 = 67 When solved it gave me; x = 25, which is incorrect.

C. x = 180 - 109 When solved it gave me; x = 71

D. 42 + 67 - x = 180 When solved it gave me; x = - 71

Therefore the answer is C.

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Which graph correctly represents this 2y+x=-5and y+3x=0

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Answer:

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2 years ago

In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected for a

Softa [21]

Answer:

95% Confidence interval = (23.4,26.2)

Step-by-step explanation:

In this problem we have to develop a 95% CI for the mean.

The sample size is n=49, the mean of the sample is M=24.8 and the standard deviation of the population is σ=5.

We know that for a 95% CI, the z-value is 1.96.

The CI is

$M-z*\sigma/\sqrt{n}\leq\mu\leq M+z*\sigma/\sqrt{n}\\\\24.8-1.96*5/\sqrt{49}\leq\mu\leq 24.8+1.96*5/\sqrt{49}\\\\ 24.8-1.4\leq\mu\leq 24.8+1.4\\\\23.4\leq\mu\leq 26.2$

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3 years ago

uincy uses the quadratic formula to solve for the values of x in a quadratic equation. He finds the solution, in simplest radica

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Answer: according to spark notes: There can be 0, 1, or 2 solutions to a quadratic equation, depending on whether the expression inside the square root sign, (b2 - 4ac), is positive, negative, or zero. This expression has a special name: the discriminant.

In this case it is 0, not 2, which was my first and wrong answer

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3 years ago

Read 2 more answers

2. Find the gross monthly income from this job and calculate your monthly take-home pay.

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Answer:

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3 years ago

John's bank notified him that he had a negative checking account balance of -$125.70. If John makes two deposits of $89.32 each,

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3 years ago