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2 years ago

???????????????????????

Mathematics

1 answer:

drek231 [11]2 years ago

7 0

Answer:

x ≅ 7

Step-by-step explanation:

cos(67°) = x/18

x = 18cos(67°) ≅ 7

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Use the expression 8a + 16c.

irakobra [83]

Answer:

PA) 8

PB) 45

Step-by-step explanation:

PA) Find the prime factors of each term in order to find the greatest common factor (GCF).

PB)

Step 1:

(8 x 5) + (16 x -1)

Step 2: Multiply

40 + 15

Step 3: Add

5 0

2 years ago

Let f(x)=x-2 and g(x) = x^3 . What is (f•g)(2)

NemiM [27]

Answer:

f(x)=x2

g(x)=3x+2

(f+g)(x)=x2+3x+2=(x+1)(x+2)

Step-by-step explanation:

Explanation:

4 0

1 year ago

-10 + square root of 2x+1 = -5

Citrus2011 [14]

Answer:

Step-by-step explanation:

-10+sqrt2x+1 = -5

sqrt2x+1 = -5+10

sqrt2x+1 = 5

2x+1 = sqrt5

2x = sqrt5-1

x = (sqrt5-1)/2

5 0

2 years ago

Rob has 96 football cards.Rob filled 3 fewer plastic boxes with football cards than basketball cards.He filled 9 boxes with bask

avanturin [10]

Answer: 16 boxes and 6 football cards in each box.

Step-by-step explanation:

Here total football cards rob has = 96

And, He filled 9 boxes with basketball cards.

Also, Rob filled 3 fewer plastic boxes with football cards than basketball cards.

Therefore, football cards in each boxes = 9 - 3 = 6

Thus, the number of boxes he can fill with football cards = 96/6 =16

7 0

2 years ago

In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6977subjects randomly selec

kirza4 [7]

Answer:

Given :An Internet survey was e-mailed to 6977 subjects randomly selected from an online group involved with ears. There were 1337 surveys returned.

To Find : Use a 0.01 significance level to test the claim that the return rate is less than 20%.

Solution:

n = 6977

x = 1337

We will use one sample proportion test

$\widehat{p}=\frac{x}{n}$

$\widehat{p}=\frac{1334}{6977}$

$\widehat{p}=0.1911$

We are given that the claim is the return rate is less than 20%.

$H_0:p=0.2\\H_a:p$

Formula of test statistic = $\frac{\widehat{p}-p}{\sqrt{\frac{p(1-p)}{n}}}$

= $\frac{0.1911-0.2}{\sqrt{\frac{0.2(1-0.2)}{6977}}}$

= $−1.858$

Refer the z table

P(z<-1.85)=0.0332

Significance level = 0.01=α

Since p value > α

So, we accept the null hypothesis .

So,the claim that the return rate is less than 20% is false.

7 0

2 years ago