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dybincka [34]
3 years ago
14

Explanation for B. or D. please.

Mathematics
2 answers:
balu736 [363]3 years ago
8 0
The correct answer is B
ELEN [110]3 years ago
4 0
The right is answer is B
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Amanda can dig a 10ft by 10ft hole in seven hours. Ming can dig the same hole in 10 hours. How long to dig the hole if they work
Klio2033 [76]

Answer:

The answer should be 4.12 hours

Step-by-step explanation:

Sorry if I am wrong.

5 0
3 years ago
~~~ 30 POINTS ~~~
trasher [3.6K]
<span>1)   3x-2=x+10


</span><span>Now, lets solve this step-by-step.
</span><span>
3x - 2 = x + 10
-x             -x
</span><span>
</span><span>3x - x = 2x                                2x - 2 = 10
</span><span>
</span><span>2x - 2 = 10
</span>2x - 2+2 = 10+2          The inverse operation helps isolate the variable. 
<span>
2x = 12

2x/2 = 12/2

x = 12/2
x = 6</span><span>

Answer: x = 6

2) x + 4 = 19 - 2x </span>

We can solve this much faster

x + 4 = 19 - 2x
                  +2x

x+2x = 3x

3x + 4 = 19
      -4     -4

19-4 = 15

3x= 15
3x/3 = 15/3
x= 5

Answer: x = 5

3) 
<span>8x - 20 = x + 15

Much faster now!!

8x - 20 = x + 15
               -x
8x-x = 7x

7x - 20 = 15
      +20   +20
15+20 = 35

7x = 35
7x/7 = 35/7
x = 35/7
x = 5

Answer: x= 5</span>
3 0
3 years ago
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Sin (3x+15) = Cos (7x-2)<br><br> Find value of x
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\bf \begin{array}{lcllclll}&#10;sin(&90^o-\theta)&=&cos(&\theta)\\&#10;&\uparrow &&&\uparrow \\&#10;&3x+15&&&7x-2\\&#10;&\downarrow \\&#10;&90-(7x-2)&#10;\end{array}&#10;\\\\\\&#10;90-(7x-2)=3x+15\implies 90-7x+2=3x+15&#10;\\\\\\&#10;92-15=10x\implies 77=10x\implies \cfrac{77}{10}=x
5 0
3 years ago
Hiii please help! i’ll give brainliest if you give a correct answer tysm!
VladimirAG [237]

answer

8/25

Step-by-step explanation:

so you would keep the first fraction (2/15) then you would change the symbol then you would flip the other fraction (5/12). then you would multiply 2*12=24 and 15*5=75. then you would simplifie it. it would be 8/25.

6 0
2 years ago
If angle a and angle b are complementary angles, they they share a common side.
Snezhnost [94]

Answer:

False.

Step-by-step explanation:

A complementary angle is an angle where two seperate angles add together for a 90 degree angle. They usually share a side, but not always.

3 0
2 years ago
Read 2 more answers
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