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3 years ago

210 students were asked whether they want to go to a water park or a roller skating rink for a class party.

Mathematics

2 answers:

tankabanditka [31]3 years ago

7 0

Answer: How many boys want to go skating

Step-by-step explanation: sorry if wrong but if you add 50 and 45 and 60 you get 155 that is not 210 so 2

bearhunter [10]3 years ago

3 0

Answer:

210 students were asked whether they want to go to a water park or a roller skating rink for a class party. 50 students are girls who want to go to the water park. 45 students are girls who want to go ... Boys: 60 want to go to the water park, 55 want to go skating. 115 boys total. Girls: 50 want to go to the water ...

Step-by-step explanation:

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An explosion causes debris to rise vertically with an initial speed of 120 feet per second. The formula h equals negative 16 t s

Novay_Z [31]

Answer:

The debris will be at a height of 56 ft when time is 0.5 s and 7 s.

Step-by-step explanation:

Given:

Initial speed of debris is, $s=120\ ft/s$

The height 'h' of the debris above the ground is given as:

$h(t)=-16t^2+120t$

As per question, $h(t)=56\ ft$ . Therefore,

$56=-16t^2+120t$

Rewriting the above equation into a standard quadratic equation and solving for 't', we get:

$-16t^2+120t-56=0\\\textrm{Dividing by -8 throughout, we get}\\\frac{-16}{-8}t^2+\frac{120}{-8}t-\frac{56}{-8}=0\\2t^2-15t+7=0$

Using quadratic formula to solve for 't', we get:

$t=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\\\\t=\frac{-(-15)\pm \sqrt{(-15)^2-4(2)(7)}}{2(2)}\\\\t=\frac{15\pm \sqrt{225-56}}{4}\\\\t=\frac{15\pm\sqrt{169}}{4}\\\\t=\frac{15\pm 13}{4}\\\\t=\frac{15-13}{4}\ or\ t=\frac{15+13}{4}\\\\t=\frac{2}{4}\ or\ t=\frac{28}{4}\\\\t=0.5\ s\ or\ t=7\ s$

Therefore, the debris will reach a height of 56 ft twice.

When time $t=0.5\ s$ during the upward journey, the debris is at height of 56 ft.

Again after reaching maximum height, the debris falls back and at $t=7\ s$ , the height is 56 ft.

5 0

3 years ago

Volume of a cube 3.8 ft 1.1 ft

balu736 [363]

Where’s the photo? But I need to answer with a photo 3.8 ft and 1.1 ft equals 4.9 ft

7 0

3 years ago

Find the slope of the line passing through the vertex and the y-intercept of the quadratic function

strojnjashka [21]

Find y intercept

y=5(0)²+20(0)-7
y=0-7
y=-7

Point(0,-7)

Find vertex

x coordinate

-b/2a
-20/10
-2

y coordinate

y=5(4)-40-7
y=-27

Vertex at (-2,-27)

Slope

m=(-27+7)/-2-0
m=-20/-2
m=10

6 0

2 years ago

Read 2 more answers

(4.23)(1.6) please multiple

Wewaii [24]

Answer:

The correct answer is 6.768.

Step-by-step explanation:

(4.23)(1.6) = 6.768

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3 years ago

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The function L = 0.8T^2 models the relationship between L, the length in feet of a pendulum, and T, the period in seconds of the

Semmy [17]

The correct option is "d".
Given that L = 0.8T²
length of pendulum = 30ft

L= 0.8T²
30 = 0.8T²
T² = 30 / 0.8
T² = 37.5
T = √37.5 = 6.1 seconds
So, 6.1 is the closest to the period in seconds for a pendulum that is 30 ft long.

7 0

3 years ago