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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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What is a number that makes an equation true
Svetach [21]

Answer:

maybe 0

Step-by-step explanation:

4 0
3 years ago
Given AB = 3x + 3 and BC = 2x + 9
BartSMP [9]

Answer:

x=6

Step-by-step explanation:

AB=BC

3x+3=2x+9

x=6

5 0
3 years ago
A 180 pound weight is supported by two ropes each at 30 degrees, as shown in the figure. Find the tension in each rope.
Anit [1.1K]

Answer:

103.9 lb.

Step-by-step explanation:

T cos 30°+T cos 30°=180

2T cos 30°=180

T=103.9 lb.

6 0
2 years ago
Read 2 more answers
Coffee café mix 90 pounds of coffee that cost six dollars per pound the types of coffee used to make this makes you cost seven d
Troyanec [42]

Answer:

y =  60

Step-by-step explanation:

From the  information we get:

x  quantity of 4 dollars  coffee used in the mix

y  quantity of 7 dollars  coffee used in the mix

For the quantity of coffee to be sold a 7 $/pound  ( 90 pounds)

Then  6*90  =  540  $

Therefore

x  +  y  =  90     and

4*x  +  7*y  =  540

A two equations system we solve for x and y

y =  90  -  x

4*x  +  7* ( 90  -  x ) = 540

4*x  +  630 - 7*x  =  540

- 3*x  =  - 90

x = 30 pounds   and

y  =  90  -  30

y  =  60

We should use  60 pounds of the seven $ coffee

4 0
2 years ago
10×+73=7 solve two step equations by using inverse operations. and use inverse operations to solve the equations ​
MrMuchimi

Answer:

x=-67/10

Step-by-step explanation:

What you have to do is first subtract 73 from both sides. that makes it 10x=7-73. That is 10x=-67. Then divide both sides by 10. That is x=-67/10

Can I get brainliest

7 0
3 years ago
Read 2 more answers
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