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Ilia_Sergeevich [38]
3 years ago
14

A man has 12 coins in his pocket, all of which are dimes and quarters. If the total value of his change is $2.70, how many dimes

and how many quarters does he have?​
Mathematics
2 answers:
enot [183]3 years ago
4 0
He has 10 quarters and 2 dimes.
Artist 52 [7]3 years ago
3 0
8 quarters and 7 dimes
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2. Use the following picture for this question:
Art [367]

Answer:

a.  24\sqrt{3}  and 41.6

b.  52.1

Step-by-step explanation:

a.

Considering the left side triangle the blue dotted side is the side "opposite" to the angle given and the side 24 is the side that is "adjacent" to the angle given. The trigonometric ratio tan relates opposite to adjacent. Also, let the blue dotted side be y.

<u>Note:</u> the exact value of tan 60 is \sqrt{3}

Thus, we can write Tan(60)=\frac{y}{24}\\y=24*Tan(60)\\y=24*\sqrt{3} \\y=24\sqrt{3}

Approximate value (rounded to nearest tenth):  24\sqrt{3} =41.6

b.

Considering the triangle to the right, the side "opposite" to the angle given (53 degrees) is 41.6 (just found in part (a)) and the side "hypotenuse" (side opposite to 90 degree angle) is x. The trigonometric ratio sine relates opposite and hypotenuse.

Thus we can write and solve:

Sin(53)=\frac{41.6}{x}\\x=\frac{41.6}{Sin(53)}=52.1

4 0
3 years ago
−5.5x + 0.46 = −3.94
aliina [53]

Answer:

x= 0.78 (rounded to the hundredth)

Step-by-step explanation:

-5.5x + 0.46 = -3.94

You need to isolate x so the easiest thing to do is subtract 0.46 and move it to the other side of the equal sign.

-5.5x= -3.84 - 0.46

-5.5x = -4.3

divide -5.5 to get x alone

x= -4.3/-5.5

x= 0.78

7 0
3 years ago
How many solutions are there to the following system of equations?
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4x-8y=0 \\&#10;\underline{-3x+8y=-7} \\&#10;4x-3x=0-7 \\&#10;x=-7 \\ \\&#10;4x-8y=0 \\&#10;4 \times (-7)-8y=0 \\&#10;-28-8y=0 \\&#10;-8y=28 \\&#10;y=\frac{28}{-8} \\&#10;y=-\frac{7}{2} \\ \\&#10; \left \{ {{x=-7} \atop {y=-\frac{7}{2}}} \right.

There is one solution to this system of equations. The answer is B.
6 0
3 years ago
Read 2 more answers
A circle has a circumference of
d1i1m1o1n [39]

Answer:

the diameter is 1

Step-by-step explanation:

Since C = pi*d, solving for d would give 1

5 0
3 years ago
I NEED HELP PLZZZ!!!!!!
trasher [3.6K]
Pretty sure the answer is D, if you simplify it, you will have 1/5
3 0
2 years ago
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