3 years ago

How many integers between 100 and 300 inclusive,are divisible by 10?

1 answer:

4 0

100≤10n≤300

10≤n≤30 

So the number of multiples of 10 from 100 to 300 inclusive is: 

(30-10+1)=21

The final answer is 21.

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Axis of symmetry: x=4; points: (3,-2), (6,-26); opening downward

Andru [333]

Vertex form is
y=a(x-h)^2+k
vertex is (h,k)
axis of symmetry is x=4, therfor h=4
y=a(x-4)^2+k

we have some points
(3,-2) and (6,-26)
input and solve for a and k

(3,-2)
-2=a(3-4)^2+k
-2=a(-1)^2+k
-2=a(1)+k
-2=a+k

(6,-26)
-26=a(6-4)^2+k
-26=a(2)^2+k
-26=a(4)+k
-26=4a+k

we have

-2=a+k
-26=4a+k
multiply first equation by -1 and add to second

2=-a-k
-26=4a+k +
-24=3a+0k

-24=3a
divide both sides by 3
-8=a

-2=a+k
-2=-8+k
add 8 to both sides
6=k

the equation is
$y=-8(x-4)^2+6$

3 0

3 years ago

A swimming pool contains 1000 gallons of water. 20 gallons is added every hour. The expression 1000 + 20h represents the number

nadya68 [22]

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3 years ago

Jordan flipped a coin 492 times. Which of the following would be a good estimate of the number of times the coin landed on heads

Irina-Kira [14]

I'd say B. but that's only because I divided the number of times he flipped the coin by the number of sides it has, 2, and came up with 246. The closest number on here to that is 231 or B. I hope I helped.

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IRINA_888 [86]

I think the answer is no

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