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Vadim26 [7]
3 years ago
8

Answer to 24 pls and thanks :D ik its super simple but im not very good at this and i forgot how to do it, and you guys get like

free points so win win :p
Mathematics
1 answer:
iogann1982 [59]3 years ago
8 0
There is no picture given for us to answer the question!
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Why do you divide by 60 after calculating the area of the trapezoid (to calculate the distance)? I got 900 but I don’t know why
Free_Kalibri [48]

Answer:

Step-by-step explanation:

What you are trying to do is a nice way to solve this problem. Without knowing any physics, you are using what math you know to get the answer. You are actually very close to being correct, and you are right. You do have to divide by 60.

Here's why and it is the one bit of physics you have to know.

The speed is km/hour. That word hour is the culprit. Your time is in minutes and you have to get it into hours. In physics, the units have to be consistent.

So ...

b1 = 19 minutes which is 19 min [1 hour / 60 minutes] = 19/60 = 0.31667 hour

b2 = 26 minutes which is 26 min [ 1 hour/60 minutes] =  26/60 = 0.4333 hour

h = 40 km/hour

Area = (0.31667 hour + 0.4333 hour)*40 km/hour /2

Area = 0.75 hour * 40 km/hr //2

Area = 15 km

6 0
3 years ago
Simplify without using the calculator or the sin tables.​
katovenus [111]

Answer:

1/8

Step-by-step explanation:

sin²(π/8) − cos⁴(3π/8)

Use power reduction formulas:

1/2 (1 − cos(2×π/8)) − 1/8 (3 + 4 cos(2×3π/8) + cos(4×3π/8))

Simplify:

1/2 (1 − cos(π/4)) − 1/8 (3 + 4 cos(3π/4) + cos(3π/2))

1/2 (1 − √2/2) − 1/8 (3 + 4 (-√2/2) + 0)

1/2 − √2/4 − 1/8 (3 − 2√2)

1/2 − √2/4 − 3/8 +√2/4

1/2 − 3/8

1/8

7 0
3 years ago
Please help me solve this 200(20)^x>500x+400
s2008m [1.1K]
Hi there!

200(20)^x > 500x + 400

Let's find the critical points of the inequality

200(20^x) = 500x + 400

Now we can divide both sides by 200

(200(20^x))/200 = (500x + 400)/200

20x^x = 5/2 x + 2

There are no critical points.

Thus,

The answer is: No solution

As always, it is my pleasure to help students like you.

6 0
3 years ago
-x2 + x-1=0
tia_tia [17]
<span>-x^2 + x-1=0 divide by (-) </span><span><span> 
</span>
 </span><span>x^2-x+1=0 </span><span><span> 
</span>
 </span><span>x=1/2(+-) root of (1/2)^2-1 </span><span><span> 
</span>
 </span><span>x=1/2(+-) root of (1/4)-1 </span><span><span> 
</span> </span><span><span> 
</span></span><span>x=1/2(+-) root of (1/4)-1 </span>  
<span>
x=1/2(+-) root of (1/4)-((4*1)/4)  </span> 
<span>
x=1/2(+-) root of (-3/4)   
</span>
 <span>which has not answers, because we can  not take a root of negatives numbers</span>
5 0
3 years ago
Read 2 more answers
What would be the reasons for lines 3 and 4? A. Addition property; subtraction property B. Addition property; solve C. Substitut
m_a_m_a [10]

Answer:

I chose

D. Substitution property; prove

5 0
3 years ago
Read 2 more answers
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