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natulia [17]
4 years ago
14

A scientist observes that a zebra ran 54 yards in 135 seconds. The zebra ran at a rate of _ feet per minute

Mathematics
1 answer:
Evgen [1.6K]4 years ago
3 0
Someone asked this question before on brainly before. The answer is on this website: brainly.com/question/946010.
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A collection of nickels and quarters is worth 2.85 . There are 3 more nickels than quarters how many nickels and quarters are th
Zolol [24]

A nickel is equal to 5 cents or 0.05 dollars.

A quarter is equal to 25 cents or 0.25 dollars.

Let number of nickels be = n

Let number of quarters be = q

0.05n+0.25q=2.85    ...........(1)

As it is given, there are 3 more nickels than quarters so equation becomes,

n=q+3   ................(2)

Plug in the value of 'n' from (2) in (1)

0.05(q+3)+0.25q=2.85

= 0.05q+0.15+0.25q=2.85

0.30q=2.70

q=9

As n=q+3 we get, n=9+3=12

Hence, there are 12 nickels and 9 quarters.

3 0
3 years ago
On a coordinate plane, a dashed straight line has a positive slope and goes through (negative 3, 1) and (0, 3). Everything to th
miss Akunina [59]

Answer:

y> \frac{2}{3}x+3

Step-by-step explanation:

we have the points

(-3,1) and (0,3)

step 1

Find the slope m of the line

The formula to calculate the slope between two points is equal to

m=\frac{y2-y1}{x2-x1}

substitute the values

m=\frac{3-1}{0+3}

m=\frac{2}{3}

step 2

Find the equation of the line in slope intercept form

y=mx+b

we have

m=\frac{2}{3}

b=3 ----> the y-intercept is the point (0,3)

substitute the values

y=\frac{2}{3}x+3

step 3

Find the equation of the inequality

we know that

The slope is positive

Everything to the left of the line is shaded ( The inequality is of the form y > ax+b or y ≥ ax+b)

Is a dashed line (The inequality is of the form y > ax+ b or y < ax+b)

therefore

The equation of the inequality is of the form y > ax+b

The inequality is

y> \frac{2}{3}x+3

see the attached figure to better understand the problem

4 0
3 years ago
Read 2 more answers
What is the equation of a line that is perpendicular to -1 +3y=9 and passes through the point (-3, 2)?​
kati45 [8]

Answer:

y-2 = 3/10(x+3)

Step-by-step explanation:

3y = 10

y = 10/3

looking for perpendicular so slope = 3/10

using the given point

y-2 = 3/10(x+3)

6 0
3 years ago
Read 2 more answers
If the circumference is 72 pi inches, what's the radius?
bekas [8.4K]
The circumference is pi times the diameter of the circle. The radius is half of the diameter. In this case, the radius is then 36.
3 0
3 years ago
BRAINLIEST ANSWER FAST!Subtract and simplify. Show work to earn full credit.
Alecsey [184]

Answer:

<h2>7y² - 6y -17</h2>

Step-by-step explanation:

(-2y^2-11y-7)-(-9y^2-5y+10)  (firstly, we remove the brackets)

-2y^2 - 11y - 7 + 9y^2 + 5y - 10

= (-2y^2 + 9y^2) + (-11y + 5y) + (-7 - 10)

=  (7y²)                  + (-6y)         + (-17)

7 0
3 years ago
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