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nadezda [96]
2 years ago
9

PLS HELP What is the value of x ? A. 42 B. 43 C. 84 D. 86

Mathematics
2 answers:
Sati [7]2 years ago
5 0
The value of X would have to be A-42
TEA [102]2 years ago
4 0

Answer:

B

Step-by-step explanation:

x+x+94 = 180 (sum of angle of triangle)

2x+94 = 180

2x = 180-94

2x = 86

x = 86÷2

Therefore x = 43

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Please help with algebra
Elodia [21]
Let x = small number
y=large numebr


x+y = 90
y-4x=15

substitute
we get:

x=21
y=90-21 = 69
5 0
3 years ago
WILL GIVE BRAINLIEST. If x+y=3 and 3x+5y=13, then x-y is equal to?
Alex17521 [72]

Answer:

(1,2)

y=2

x=1

Step-by-step explanation:

x+y=3

3x+5y=13

solve the equation

x=3-y

3x+5y=13

substitute the value of x into an equation

3(3-y)+5y=13

distribute

9-3y+5y=13

add -3y to 5y

9+2y=13

subtract 9 from both sides

2y=4

divide both sides by 2

y=2

substitute the value of y into an equation

x=3-2

subtract 3 to 2

x=1

--------

(1,2)

--------

6 0
3 years ago
help!!!!!!!!!!!!!!!!!!!!!!!!!
Simora [160]

9²+15²=a²

a=square root of 306

3 0
3 years ago
Blake, Chang, and Grace together sold 71 tickets for the school banquet. Blake sold 27 tickets and Chang sold 28 tickets. How ma
Zina [86]

Answer:

16

Step-by-step explanation:

because to get what you need add 27 and 28 and you get 55 then subtract 71 by 55 to get 16

71-(27+28)

7 0
3 years ago
4. Trace metals in drinking water affect the flavor, and unusually high concentrations can be haz-
tresset_1 [31]

Answer:

There isn't enough evidence to suggest that the true average concentration in the surface water is different than the concentration in the bottom water.

Step-by-step explanation:

We want to test if the true average concentration in the surface water is different than the concentration in the bottom water.

For this, we obtain a new distribution that is the difference between zinc concentration at the bottom and at the top for the 6 samples

A B C D E F

Zinc on surface

0.411 0.238 0.390 0.410 0.605 0.609

Zinc on bottom

0.430 0.266 0.369 0.531 0.627 0.716

Difference (zinc at bottom - zinc at surface)

0.019 0.028 -0.021 0.121 0.022 0.107

We can the find the mean of the differences and the standard deviation of the sample of differences

Mean = xbar = (Σx)/N = (0.276/6) = 0.046

Standard deviation = σ = √{[Σ(x - xbar)²]/(N-1)}

We use (N - 1) because this distribution is that of a sample.

x = each variable

xbar = mean = 0.046

N = number of variables = 6

σ = 0.055612948132607 = 0.055613

For hypothesis testing, the first thing to define is the null and alternative hypothesis.

The null hypothesis plays the devil's advocate and usually takes the form of the opposite of the theory to be tested. It usually contains the signs =, ≤ and ≥ depending on the directions of the test.

While, the alternative hypothesis usually confirms the the theory being tested by the experimental setup. It usually contains the signs ≠, < and > depending on the directions of the test.

For this question, we want to test if the true average concentration in the surface water is different than the concentration in the bottom water.

Hence, the null hypothesis is that there isn't significant evidence to suggest that the true average concentration in the surface water is different than the concentration in the bottom water.

The alternative hypothesis is that there is significant evidence to suggest that the true average concentration in the surface water is different than the concentration in the bottom water.

Mathematically, if the mean of zinc concentration at the surface and the bottom are μ₁ and μ₂ respectively and the mean difference is μ = μ₂ - μ₁

The null hypothesis is represented as

H₀: μ = 0 or μ₂ = μ₁

The alternative hypothesis is represented as

Hₐ: μ ≠ 0 or μ₂ ≠ μ₁

To do this test, we will use the t-distribution because no information on the population standard deviation is known

So, we compute the t-test statistic

t = (x - μ₀)/σₓ

x = mean difference = 0.046

μ₀ = 0

σₓ = standard error = (σ/√n)

σ = 0.055613

n = Sample size = 6

σₓ = (0.055613/√6) = 0.0227

t = (0.046 - 0) ÷ 0.0227

t = 2.026 = 2.03

checking the tables for the p-value of this t-statistic

Degree of freedom = df = n - 1 = 6 - 1 = 5

Significance level = 0.05

The hypothesis test uses a two-tailed condition because we're testing in both directions.

p-value (for t = 2.03, at 0.05 significance level, df = 5, with a two tailed condition) = 0.098613

The interpretation of p-values is that

When the (p-value > significance level), we fail to reject the null hypothesis and when the (p-value < significance level), we reject the null hypothesis and accept the alternative hypothesis.

So, for this question, significance level = 0.05

p-value = 0.098613

0.098613 > 0.05

Hence,

p-value > significance level

This means that we fail to reject the null hypothesis & say that there isn't enough evidence to suggest that the true average concentration in the surface water is different than the concentration in the bottom water.

Hope this Helps!!!

5 0
3 years ago
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