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2 years ago

9

Explain how science can help people save resources such as coal

2 answers:

vovikov84 [41]2 years ago

6 0

If we develop energy sources which do not use coal, using scientific research, our reliance on coal is diminished; for if we have a technology that doesn't use coal, we don't need to use coal.

lana [24]2 years ago

5 0

They Can recycle it and reuse things so they won't waste instead of just throwing things away

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Triangles P Q R and S T U are shown. Angles P R Q and T S U are right angles. The length of P Q is 20, the length of Q R is 16,

dimaraw [331]

Answer:

$\angle P$

Step-by-step explanation:

Given

$\triangle PRQ = \triangle TSU = 90^o$

$PQ = 20$ $QR = 16$ $PR = 12$

$ST = 30$ $TU = 34$ $SU = 16$

<em>See attachment</em>

Required

Which sine of angle is equivalent to $\frac{4}{5}$

Considering $\triangle PQR$

We have:

$\sin(P) = \frac{QR}{PQ}$ --- i.e. opposite/hypotenuse

So, we have:

$\sin(P) = \frac{16}{20}$

Divide by 4

$\sin(P) = \frac{4}{5}$

Hence:

$\angle P$ is correct

7 0

2 years ago

There are 15 cars in zack's toy collection 2/3 of the cars are red how many red cars does zack have?

Vadim26 [7]

Answer:

10 cars

Step-by-step explanation:

15 cars x $\frac{2}{3}$ = $\frac{30}{3}$ = 10 cars

8 0

2 years ago

16. A newspaper surveyed its subscribers as to which section of the paper they read first. The results are below. Is it reasonab

DanielleElmas [232]

Answer:

j

Step-by-step explanation:n

8 0

2 years ago

Jay’s father is twice as old as Jay. In 20 years Jay will be two thirds as old as his father. Find the number

oksian1 [2.3K]

Let the age of Jay be x years, so age of Jay's father is 2x years .

After 20 years,

Jay's age will be $(x+20)years$

And Jay's father age will be $(2x+20) years$

But at that time, jay's age will be

$\frac{2}{3} (2x+20) years$

So we have

$x+20 = \frac{2}{3} (2x+20)$

Cross multiplication

$3(x+20) = 2(2x+20)
\\
3x+60 = 4x + 40
\\
60-40 = 4x-3x
\\
x=20 years$

Therefore Jay's age is 20 years and Jay's Father's age is 40 years .

3 0

2 years ago

Read 2 more answers

1. The following sinusoid is plotted below. Complete the following steps to model the curve using the cosine function.

egoroff_w [7]

1. Vertical shift, when k is outside of the parenthesis it indicates the translation up or down. Positive k is up and negative k is down.

2. Horizontal shift, when k is inside of the parenthesis it indicates the translation left or right. BE CAREFUL: positive k is left and negative k is right. Don’t get these mixed up

8 0

2 years ago