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dezoksy [38]
3 years ago
9

Разстоянието между селищата A и B е 410 км.От A за B пътува лека кола със скорост 90km/h, а 1 h по-късно от B за A тръгва камион

, движещ се със скорост, която е 7÷9 от скоросттана леката кола. Намерете след колко време от тръгването на леката кола двете превозни средства ще се срещнат.​
Mathematics
1 answer:
harkovskaia [24]3 years ago
4 0

4,56 км / ч просто разделят ускорението и точката на среща.

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Factor<br> 3x^2+5x-8<br> Use step by step explaining how you got that answer
8_murik_8 [283]

Answer: (x-1)(3x+8)

Step-by-step explanation:

Slide and divide method

See what multiplies to get -24 (because of 3 and -8) and what adds to get 5

Put those into factoring form (x-3)(x+8) without a number in front of the x’s

Divide the numbers by what isn’t in front of the x’s (-3/3 and 8/3)

Simplify them and if it doesn’t divide perfectly, put the denominator in front of the x

Solution

**I can’t explain it well but watch a video on the method AND ONLY DO IT IF IT WORKS WELL FOR YOU**

8 0
3 years ago
The mean income per person in the United States is $50,000, and the distribution of incomes follows a normal distribution. A ran
sergij07 [2.7K]

Answer:

Yes. There is sufficient eveidence to support  the claim that Wilmington resident's earn more than the national average

Step-by-step explanation:

Given the following;

\alpha=Significance \ Level=0.05\\n=10\\\bar X=60000\\\ s=sample\  \sigma=10000

#We set our hypothesis as:

H_o:\mu\leq 50000\\H_a:\mu>50000

The rejection region of either hypothesis:

P(t>t_o)=0.05, we determine the critical values for this probability in the T distribution table;

t=1.833

=>We reject for all values greater than 1.833, t>1.833.

#We now determine the value of the test statistic as:

t=\frac{\bar X-\mu_o}{s/\sqrt{n}}\\\\=\frac{60000-50000}{10000/\sqrt{10}}\\\\=3.1623

We find that:

t=3.1623>1.833,\ \ \ Reject \ H_o

Hence, there is sufficient eveidence to support  the claim that Wilmington resident's earn more than the national average.

4 0
3 years ago
Mallory is 2 years older than three times her brother Jake’s age. Let j represent Jake’s age. During the Strategize step of the
DedPeter [7]
Let j = Jake's age.
Because Mallory is 2 years older than three times Jake, Mallory's age is
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Answer: Mallory's age is 3j + 2
6 0
4 years ago
How should I explain how I know that 984/616 = 123/77 ?
Anon25 [30]

True they are equal

Step-by-step explanation:

123/77=

123×8/77×8

=984/616

6 0
3 years ago
Simplify powers of i.<br> ASSIGNMENT<br> Simplify each of the following powers of i.<br> I^32
algol [13]

Answer:

i^15=-i

i^32=1

1^99=-i

i^22=-1

hope this helps :)

im sorry for the late answer, i put all the answers incase some one needs them, have a nice day!

Step-by-step explanation:

5 0
3 years ago
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