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Rina8888 [55]
3 years ago
13

I will mark you brainlist!

Mathematics
1 answer:
valina [46]3 years ago
4 0

Answer:

72 people.

Step-by-step explanation:

4 out of 10 is 40%. Now apply that to 180. 40% of 180 is 72. Hope this helps.

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Element X decays radioactively with a half life of 12 minutes. If there are 690 grams of Element X, how long, to the nearest ten
Alexeev081 [22]

Answer:

the answer and explanation of the question is in the picture

Step-by-step explanation:

hope this helps

please like and Mark as brainliest

7 0
3 years ago
Please help me <br> Show your work <br> 10 points
Svet_ta [14]
<h2>Answer</h2>

After the dilation \frac{5}{3} around the center of dilation (2, -2), our triangle will have coordinates:

R'=(2,3)

S'=(2,-2)

T'=(-3,-2)

<h2>Explanation</h2>

First, we are going to translate the center of dilation to the origin. Since the center of dilation is (2, -2) we need to move two units to the left (-2) and two units up (2) to get to the origin. Therefore, our first partial rule will be:

(x,y)→(x-2, y+2)

Next, we are going to perform our dilation, so we are going to multiply our resulting point by the dilation factor \frac{5}{3}. Therefore our second partial rule will be:

(x,y)→\frac{5}{3} (x-2,y+2)

(x,y)→(\frac{5}{3} x-\frac{10}{3} ,\frac{5}{3} y+\frac{10}{3} )

Now, the only thing left to create our actual rule is going back from the origin to the original center of dilation, so we need to move two units to the right (2) and two units down (-2)

(x,y)→(\frac{5}{3} x-\frac{10}{3}+2,\frac{5}{3} y+\frac{10}{3}-2)

(x,y)→(\frac{5}{3} x-\frac{4}{3} ,\frac{5}{3}y+ \frac{4}{3})

Now that we have our rule, we just need to apply it to each point of our triangle to perform the required dilation:

R=(2,1)

R'=(\frac{5}{3} x-\frac{4}{3} ,\frac{5}{3}y+ \frac{4}{3})

R'=(\frac{5}{3} (2)-\frac{4}{3} ,\frac{5}{3}(1)+ \frac{4}{3})

R'=(\frac{10}{3} -\frac{4}{3} ,\frac{5}{3}+ \frac{4}{3})

R'=(2,3)

S=(2,-2)

S'=(\frac{5}{3} (2)-\frac{4}{3} ,\frac{5}{3}(-2)+ \frac{4}{3})

S'=(\frac{10}{3} -\frac{4}{3} ,-\frac{10}{3}+ \frac{4}{3})

S'=(2,-2)

T=(-1,-2)

T'=(\frac{5}{3} (-1)-\frac{4}{3} ,\frac{5}{3}(-2)+ \frac{4}{3})

T'=(-\frac{5}{3} -\frac{4}{3} ,-\frac{10}{3}+ \frac{4}{3})

T'=(-3,-2)

Now we can finally draw our triangle:

8 0
3 years ago
Can somoene help me with this question please
Alex

Answer:

About 260 seconds

Step-by-step explanation:

Tha rate is:

A: 8L/1.66666m

b: 10L/1m (converted to litres)

Divide 2400 by those rates above which:

2400 / (8/1.66666) = 500

2400 / (10/1) = 240

500 - 240 = 260

7 0
2 years ago
In each part that​ follows, you are given an equation of a line and a point. Find the equation of the line through the given poi
Semmy [17]

Answer:

a) y=-\frac{1}{9}x

b)y-2=-\frac{1}{3} (x-1)

Step-by-step explanation:

We can write the equation of a line in 3 different forms including slope intercept, point-slope, and standard depending on the information we have. We have a point given and a slope from the equation. We will chose point-slope since we have a point and can find the slope.

Point slope:y-y_1=m(x-x_1)

a) m\neq 9 in our new equation because it is perpendicular to it. This means we will need to change it into its negative reciprocal which is m=-\frac{1}{9}.

We will substitute m=-\frac{1}{9} and x_1=0\\y_1=0.

y-0=-\frac{1}{9} (x-0)

This simplifies to:

y=-\frac{1}{9}x

b) The equation y=3x+4 follows y=mx+b. For the perpendicular line, m\neq 3. We will need to change it into its negative reciprocal which is m=-\frac{1}{3}.

We will substitute m=-\frac{1}{3} and x_1=1\\y_1=2.

y-2=-\frac{1}{3} (x-1)


4 0
3 years ago
Find the y-intercept of the graph of the equation y=-3x-4
Nataly [62]

Y=mx+b   Slope is m   Y intercept is b   So it's-4

5 0
3 years ago
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