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3 years ago

Please help ASAP! I will mark Brainliest! Please answer CORRECTLY! No guessing!

Mathematics

2 answers:

Illusion [34]3 years ago

5 0

Answer:

d I'm sorry if its incorrect

ryzh [129]3 years ago

4 0

Answer:

D is The correct Answer

Step-by-step explanation:

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Systems of equations. Y= -3x+1 Y=x-3 How do i start it

Anvisha [2.4K]

You can set both equations together

y = -3x + 1

and y = x - 3

we can replace the y of one equation with the other side

-3x+1 = x-3

add 3x on both sides

1 = x + 3x -3
add 3 on both sides

1 + 3 = x+ 3x

simplify

4 = 4x

divide by 4 on both sides

x = 1

y = x - 3
y = 1 - 3
y = 2

So the solution is: (1,2)

4 0

4 years ago

Amanda works as a babysitter. The table shows the total amount Amanda earns per week and the number of hours she babysits in tho

Step2247 [10]

20 180
25 225
27 243
30 270
y=9x

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3 years ago

A 5-foot tall person standing with her back to the sun casts an 12-foot long shadow. To the nearest degree, what angle does the

swat32

Answer:

23°

Explanation:

1) Data:

a) height of the person = opposite-leg to the angle the sun makes with the ground = 5 ft

b) length of the shadow = adjacent-leg to the angle the sun makes with the ground = 12 ft

c) angle, α = ?

2) Solution

tanα = opposite-leg / adjacent-leg

tanα = 5 ft / 12 5t = 5/12

α = arctan(5/12) = 22.6°

22.6° rounded to the nearest degree is 23° ← answer

5 0

3 years ago

How much did the roses cost?

Lubov Fominskaja [6]

Answer: The roses costed $9

Step-by-step explanation:

3 multiplied by 3 equals 9

1 multiplied by 6 equals 6

9+6=15

6 0

3 years ago

In Pennsylvania the average IQ score is 101.5 The variable is normally distributed and the population standard deviation is know

elena-14-01-66 [18.8K]

Answer:

P-value = 0.0368

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 101.5

Sample mean, $\bar{x}$ = 106.4

Sample size, n = 30

Alpha, α = 0.05

Population standard deviation, σ = 15

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 101.5\\H_A: \mu> 101.5$

We use One-tailed(right) z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{106.4 - 101.5}{\frac{15}{\sqrt{30}} } = 1.789$

Now, $z_{critical} \text{ at 0.05 level of significance } = 1.64$

Since,

$z_{stat} > z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis. Thus, students in Pennsylvania have an IQ that is significantly greater than the state average.

P-value can be calculated with the standard normal table.

P-value = 0.0368

P-value is lower than the significance level.

4 0

3 years ago