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3 years ago

Follow the steps to solve this equation:

Mathematics

2 answers:

saw5 [17]3 years ago

5 0

4X-8=12
+8 +8

4x/4=20/4

X=5

seropon [69]3 years ago

4 0

Answer:

x= 5 (i did it and got it right i read through what i had to do and got 5 as my anwser so i hope this helps you

Step-by-step explanation:

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1)Sheyna drive to the lake and back. It took two hours less time to get there than it did to get back. The average speed on the

ipn [44]

Answer:

8 hours

Step-by-step explanation:

Given:

Sheyna drives to the lake with average speed of 60 mph and

$v_1 = 60\ mph$

Sheyna drives back from the lake with average speed of 36 mph

$v_2 = 36\ mph$

It took 2 hours less time to get there than it did to get back.

Let $t_1$ be the time taken to drive to lake.

Let $t_2$ be the time taken to drive back from lake.

$t_2-t_1 = 2$ hrs ..... (1)

To find:

Total time taken = ?

$t_1+t_2 = ?$

Solution:

Let D be the distance to lake.

Formula for time is given as:

$Time =\dfrac{Distance}{Speed }$

$t_1 = \dfrac{D}{60}\ hrs$

$t_2 = \dfrac{D}{36}\ hrs$

Putting in equation (1):

$\dfrac{D}{36}-\dfrac{D}{60} = 2\\\Rightarrow \dfrac{5D-3D}{180} = 2\\\Rightarrow \dfrac{2D}{180} = 2\\\Rightarrow D = 180\ miles$

So,

$t_1 = \dfrac{180}{60}\ hrs = 3 \ hrs$

$t_2 = \dfrac{180}{36}\ hrs = 5\ hrs$

So, the answer is:

$t_1+t_2 = \bold{8\ hrs}$

8 0

3 years ago

Solve this please!!!!!

AlladinOne [14]

20) Answer is: x=76
21) Answer is x=15

3 0

2 years ago

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A) Work out 5% of 240

Pani-rosa [81]

Answer:

12 sorry if its wrong

Step-by-step explanation:

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3 years ago

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Many states assess skills of their students in various grades. One program that is available for this purpose is the NAEP. One o

Hoochie [10]

Solution :

Given :

National mean score of the reading test that is conducted the NAEP = 288

Standard deviation of the score = 38

Therefore, P(X > x) = 0.25

P (Z > $\frac{x-288}{38}$ = 0.674)

$\frac{x-288}{38} = 0.674$

$x=288+(38 \times 0.674)$

x = 326.67

Therefore, the highest score that is needed for the students to be in the top of 25 percent among the students those who take the exam.

5 0

2 years ago

Evaluate. Pay close attention to all brackets and signs. [-2.99] + [2.99]

Elena-2011 [213]

Alright, so [-2.99] is -2.99, and [2.99] is 2.99, so -2.99+2.99=0

3 0

3 years ago

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