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nydimaria [60]
3 years ago
7

Please help with these

Mathematics
1 answer:
MatroZZZ [7]3 years ago
8 0
Set up a proportion.

\frac{3~minutes}{2~questions} = \frac{x~minutes}{12~questions}

Cross multiply.

2x=36
x=12

It would take her 12 minutes.

-----------------------------------------

Formula for surface area of a cube: 6a² where a=20.

6 x (20)²
6 x 400
= 2400

Surface area: 2400 cm

----------------------------------------------

Mean absolute deviation: The average distance from each number in the set to the mean of the set.

Mean of the set: \frac{(3+8+10+12+15)}{5} =  \frac{48}{5} = 9.6

9.6-3=6.6
9.6-8=1.6
10-9.6=0.4
12-9.6=11.4
15-9.6=5.4

Mean of 6.6, 1.6, 0.4, 11.4, and 5.4: \frac{(6.6+1.6+0.4+11.4+5.4)}{5} =  \frac{25.4}{5} = 5.08
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Help with these math exercises, please!
lions [1.4K]
1) (3-x) x (3+x)

2) 5(5-x) x (5+x)

3) (3v-wy) x (3v+wy)

4) 2(k-m) x (k+m) x (k^2+m^2)

5) (ab-4c) x (ab+4c)

Brainliest?
4 0
3 years ago
What compound inequality describes this graph
nadezda [96]

Answer:

0≥x<4

Step-by-step explanation:

first, let's look at this number line.

there is a closed circle at 0 and an open circle at 4. this means that 0 is included (≤ or ≥) and that 4 is not included (< or >).

these are the endpoints, meaning that in this compound inequality, the numbers next to the symbols are 0 and 4.

x is in the middle of this compound inequality.

0    x    4

now, we have to figure out the symbols in between. i wrote out our choices above for each number. the highlighted portion is greater than or equal to 0 and less than 4, so we can write this compound inequality as the following:

0≥x<4

x is greater than or equal to 0, but less than 4

4 0
3 years ago
Triangle QRS has been rotated 90° to create triangle TVU. Using the image below, prove that lines RS and VU have the opposite an
Zanzabum

Answer:

If the line RS has been rotated 90 degrees, then VU will be perpendicular to RS and the two slopes must be opposite and reciprocal, i.e. product of the two slopes will equal -1.

As a verification, we find the locations of V and U from rotations of R & S.

(actually, the triangle had been rotated -90&deg;, 90 &deg; clockwise)

Step-by-step explanation:

Slope RS, m1:

Slope VU, m2

Hence m1*m2=1*-1=-1, meaning that m1 and m2 are opposite (in sign) and are reciprocal to each other, as expected

6 0
3 years ago
John Paul gave the cashier $50 to pay for 8 bags of apples. The cashier gave him $17.49 in change.
Leona [35]
I believe the answer is $4.06

let me know if i’m wrong though
8 0
3 years ago
Read 2 more answers
What is a square root?<br> DO NOT USE GOOGLE TO ANSWER THIS.
Afina-wow [57]

Sure.

A square root is the number or factor that, when multiplied by itself, will equal the number.

For example:

√49 = 7 (read as "the square root of 49 equals seven"

7 * 7 = 49 (read as "seven times seven equals 49"

7^2 = 49 (read as "seven squared equals 49"

Using an exponent and raising a number to the power of 2 squares it, which multiplies it by itself.

It is helpful to memorize all square roots up to 144, which is 12.

7 0
3 years ago
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