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Talja [164]
2 years ago
15

To break the school’s record, the girls’ time had to be faster than

Mathematics
1 answer:
Finger [1]2 years ago
3 0

Answer:The answer is no they are slower by 20%

Step-by-step explanation:divide 12 by 5 then divid the answer of 12 by 5 by 2 then you get the answer of 20%

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My parents recently moved to the Poconos, they got 30 or more inches of snow from this last snow storm. It took my Dad 2 hours t
never [62]

To determine how much will it take to clean a 120ft driveway considering that it took him 2hs to clear 10ft and that the cleaning rate is constant, you can use cross multiplication:

10ft______2hs

120ft_____xhs

If the cleaning rate is the same, then the ratios between both are the same:

\frac{2}{10}=\frac{x}{120}

From this expression, you can determine the time by multiplying both sides of the equal sign by 120

\begin{gathered} 120(\frac{2}{10})=\frac{120x}{120} \\ 24=x \end{gathered}

It will take him 24 hours to clear the 120ft driveway.

5 0
1 year ago
If the factors of a quadratic function are (x + 2) and (x − 9), what are the x-intercepts of the function? A. (2,0) and (9,0) B.
Mumz [18]

Answer:

D. (-2,0) and (9,0)

Step-by-step explanation:

set the two factors equal to zero and find your two x values and those are the x intercepts. ( y value for x intercepts are always zero)

4 0
3 years ago
Read 2 more answers
Helllllppppp I will give u BRAAAIINLIAAST
scoray [572]

Step-by-step explanation:

fro the figure

2z = 68

z = 68/2

z =34

also

v + 68 = 180

v = 180 - 68

v = 112

also

v = x

7 0
1 year ago
Please help!! Will give brainiest!
aksik [14]

1. B U C = {1, 2, 3, 4, 5, 6}

Why? Because all we're doing is combining the two sets B and C to form one bigger set. We toss out any duplicates. In this case, there aren't any duplicates to worry about. Set B contains {2,4,6} and set C has {1,3,5}, putting them together leads to {2,4,6,   1,3,5} which sorts to {1,2,3,4,5,6}. Sorting is optional but helpful. The "U" symbol represents "set union". The upside down version of this symbol means "set intersection".

===========================================

2. A intersect B = {2,4}

Note how the numbers 2 and 4 are in BOTH set A and set B at the same time. This is where the two sets overlap or intersect or what they have in common.

===========================================

3. A intersect C = {1,3,5}

Similar to problem 2 above. Set A and set C both have 1,3,5 in them and nothing else shared between the two sets.

===========================================

4. A intersect (B intersect C) = null or empty set

Start with comparing set B and set C. Note how they have nothing in common. We can replace "B intersect C" with "null set", as this is the empty set, ie there's nothing in here. We end up with "A intersect null set" which ultimately leads to the empty set as the final answer. The empty set is a subset of all sets. The null set can be written as \varnothing

===========================================

5. A U (B intersect C) = {1,2,3,4,5}

Back in problem 4 we saw that "B intersect C" reduced to the empty set. We can update problem 5 into "A U nullset" which simplifies to just set A. Unioning the empty set with any set leads to the original set. Its the same as saying "take a bucket of items and add nothing to that bucket, you will still have that original bucket of items".

5 0
2 years ago
A party-favor bag must have a volume of 140 cubic inches and the dimensions that are shown below. The equation x3+6x2-27x=140 ca
ehidna [41]

Answer:

B The length is 5 inches, the width is 2 inches, and the height is 14 inches.

Step-by-step explanation:

The equation that desribes the volume of a party-favor bag is

x^3+6x^2-27x-140=0.

The solutions of theis equation can be found among divisors of -140. The divisors are:

\pm1, \pm2, \pm4, \pm5, \pm 7,\pm 10, \pm 14, \pm 20, \pm 35, \pm 70, \pm 140.

Note that

5^3+6\cdot 5^2-27\cdot 5-140=125+150-135-140=275-275=0,

so

x=5

is the solution of the equation.

Hence,

the length is 5 inches, the width is 5-3=2 inches and the height is 5+9=14 inches.

4 0
3 years ago
Read 2 more answers
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