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3 years ago

Need help ASAP!!!!!!!!!!!!!!!!!

Mathematics

1 answer:

rosijanka [135]3 years ago

8 0

Answer:

A 97

Step-by-step explanation:

Adds to 180 degrees. 83 + 97 = 180

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Gnom [1K]

85c - 0.5(85c) = 161.5
85c - 4.25c = 161.5
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==================
x - 3 < -7 x + 5 > = 8
x < -7 + 3 x > = 8 - 5
x < -4 x > = 3

open circle on -4, shading to the left....closed circle on 3, shading to the right

7 0

3 years ago

-4x=30-2y , - 15 = - 2y + 11x Which the first step determining the given ordered pair solution?A. Replace x with 13 and y with -

Andru [333]

Answer:

B. Solve each equation for a variable

Is (-1,13) a solution of the system: Yes it is x =1, y= 13

Step-by-step explanation:

-4x=30-2y

- 15 = - 2y + 11x

-4x=30-2y

-2y+4y = -30-------------------i

- 2y + 11x= - 15 ---------------ii

make x the subject of formula in equ i

-4x=30-2y

x= (30-2y)/-4

insert x= (30-2y)/-4 in equ ii

- 2y + 11x= - 15

-2y+ 11((30-2y)/-4)= -15

-2y+(330-22y)/4 = -15

-8y+330-22y/4 = -15

-8y-22y+330/4= -15

cross multiply

-30y+330 = 4x-15 = -60

-30y = -60-330

-30y =--390

y= -390/-30 = 13

if y = 13

x = (30-2y)/-4 = (30-2x13)/-4 = (30-26)/4 = 4/4 = 1

x=1 , y=13

4 0

3 years ago

Test the claim that the proportion of people who own cats is larger than 40% at the 0.025 significance level. The null and alter

Alecsey [184]

Answer:

H 0 : p ≤ 0.4 H a : p > 0.4

And based on the alternative hypothesis we can conclude that we have a right tailed test

Step-by-step explanation:

Data given

n=300 represent the random sample size

$\hat p=0.45$ estimated proportion of people with cats

$p_o=0.40$ is the value that we want to test

$\alpha=0.025$ represent the significance level

z would represent the statistic

$p_v$ represent the p value

Null and alternative hypothesis

We want to test if the true proportion of people with cats is higher than 0.4, so then the best alternative is:

Null hypothesis: $p\leq 0.4$

Alternative hypothesis: $p > 0.4$

H 0 : p ≤ 0.4 H a : p > 0.4

And based on the alternative hypothesis we can conclude that we have a right tailed test

The statistic is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

Replacing we got:

$z=\frac{0.45 -0.4}{\sqrt{\frac{0.4(1-0.4)}{300}}}=1.768$

5 0

3 years ago

A post it note has an area of A square inches. The width of the post it note is 4 inches.which equation represents X the length

SVEN [57.7K]

Answer:

Option C. X=A/4

Step-by-step explanation:

we know that

The area of the rectangular post it note is equal to

$A=LW$

where

L is the length

W is the width

In this problem we have

$W=4\ in$

$L=X\ in$

substitute

$A=4X$

solve for x

That means ----> isolate the variable x

Divide by 4 both sides

$X=\frac{A}{4}$

6 0

4 years ago

Express b+1/3b-2 with “b” as the subject

lara [203]

Answer:

b = $\frac{1+2a}{3a-1}$

Step-by-step explanation:

Given

a = $\frac{b+1}{3b-2}$ ( multiply both sides by 3b - 2 )

a(3b - 2) = b + 1 ← distribute left side

3ab - 2a = b + 1 ( subtract b from both sides )

3ab - b - 2a = 1 ( add 2a to both sides )

3ab - b = 1 + 2a ← factor out b from each term on the left side

b(3a - 1) = 1 + 2a ( divide both sides by 3a - 1 )

b = $\frac{1+2a}{3a-1}$

4 0

3 years ago