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2 years ago

4

Help please I need to finish today

1 answer:

sergey [27]2 years ago

3 0

where I need pic or questions

You might be interested in

Oscar is washing cars to earn extra money.Goal is to wash 45 cars. he can wash 5 cars per day. Which equation can he use to find

Rama09 [41]

d is grater than or equal to 5 divided by 45

8 0

3 years ago

Find the area of the trapezoid!!!! PLEASE HELP!!!!

san4es73 [151]

ANSWER

$32 \sqrt{3} {ft}^{2}$

EXPLANATION

The area of a tra-pezoid is half times sum of the bases times the vertical height.

From the diagram ( see attachment) we use the Pythagoras Theorem to obtain,

${x}^{2} + {(4 \sqrt{3}) }^{2} = {8}^{2}$

${x}^{2} + 48 = 64$

${x}^{2} = 64 - 48$

${x}^{2}=16$

$x = \sqrt{16} = 4ft$

This implies that , y=10-4=6ft

The area of tra-pezoid

$= \frac{1}{2} (10 + 6) \times 4 \sqrt{3}$

$= \frac{1}{2} (16) \times 4 \sqrt{3}$

$= 8\times 4 \sqrt{3}$

$= 32 \sqrt{3} {ft}^{2}$

6 0

4 years ago

What does w and y equal?

Keith_Richards [23]

W+y=25 and 9.95w+11.5y=276.65
solve for w in equation one:
w+y=25
w=25-y
then substitute w in equation two and solve for y:
9.95w+11.5y=276.65
9.95(25-y)+11.5y=276.65
1.55y+248.75=276.65
1.55y+248.75-248.75=276.65-248.75
1.55y=27.9
1.55y/1.55=27.9/1.55
y=27.9/1.55=18
y=18
then substitute y=18 into the first equation to solve for x:
w+y=25
rewrite as w=25-y y=18
w=25-18
w=7
then are answer is w=7 and y=18

5 0

3 years ago

It is known that a particular laboratory task takes the average person 2.5 seconds. A researcher was interested in whether older

Alchen [17]

Answer:

The decision rule is

Fail to reject the null hypothesis

The conclusion is

There is no sufficient evidence to conclude that older people are slower

Step-by-step explanation:

From the question we are told that

The average time taken is $\mu = 2.5 \ seconds$

The sample size is $n = 30$

The sample mean is $\= x = 2.7 \ seconds$

The standard deviation is $\sigma = 1.4 \ seconds$

The null hypothesis is $H_o: \mu = 2.5$

The alternative hypothesis is $H_a : \mu > 2.5 \ seconds$

Generally the test statistics is mathematically represented as

$z = \frac{\= x - \mu }{ \frac{\sigma }{ \sqrt{n} } }$

=> $z = \frac{ 2.7 -2.5 }{ \frac{1.4}{ \sqrt{30} } }$

=> $z = 0.7825$

From the z table the area under the normal curve to the right corresponding to 0.7825 is

$p-value = P(Z > 0.7825 ) = 0.21696$

So from the question we see that the $p-value > \alpha$ hence

The decision rule is

Fail to reject the null hypothesis

The conclusion is

There is no sufficient evidence to conclude that older people are slower

5 0

3 years ago

2.9645 divided by 0.35 =

k0ka [10]

<span>8.47 is the answer

Hope it helps :)

</span>

5 0

3 years ago