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enot [183]
3 years ago
5

A coin contains 9 grams of nickel and 16 grams of copper, for a total weight of 25 grams. What percentage of the metal in the co

in is copper?
Mathematics
2 answers:
I am Lyosha [343]3 years ago
6 0

Answer:

<h2>The coin has 64% of copper</h2>

Step-by-step explanation:

To find the percentage of copper that the coin has, we just have to divide the grams of the copper with the total grams of the coin, that will gives us the percentage representation of the copper

\frac{16}{25}=0.64 \ (or \ 64\%)

Therefore, the coin has 64% of copper and 35% of nickel.

Leya [2.2K]3 years ago
5 0
X for coin Y for copper
9X+16Y=25
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Do the three points lie on one line?
padilas [110]

Answer:

Yes. No graph paper.

Step-by-step explanation:

Let's say the 3 points are A, B, C.

If A, B and C lie on one line then m_{AB} = m_{BC} = m_{AC}

m_{AB} = \frac{y_{B}-y_{A} }{x_{B}-x_{A}} = \frac{2-6}{3-5} = \frac{-4}{-2} = 2\\m_{BC} = \frac{y_{C}-y_{B} }{x_{C}-x_{B}} = \frac{8-2}{6-3} = \frac{6}{3} = 2\\\\m_{AC} = \frac{y_{C}-y_{A} }{x_{C}-x_{A}} = \frac{8-6}{6-5} = \frac{2}{1} = 2\\\\

Hence, they lie on one line.

You don't need to use a graph paper to prove it.

4 0
2 years ago
Please answer ASAP. Thank you! :)
laila [671]
You will have to find what x is to get your answer solve each to find the answer
7 0
3 years ago
A school has a new flag that must be flown at last 52 feet high The current flagpole is 14 m tall How many meters taller does th
ohaa [14]
To start with, convert 52 feet into metres
1 Feet= 0.3048
52 feet= ?
The number of meters= 52*0.3048
The number of meters= 15.8496 metres

The school need to add a further 1.8496 metres
6 0
3 years ago
I’m not to sure on how to find CEB can someone explain how to find it and what the answer would be,please
lakkis [162]

Answer:

m∠CEB is 55°

Step-by-step explanation:

Since ∠ADE = 55°, and ∠ADE is half of ∠ADC because ED bisects ∠ADC. Bisect means to cut in half.

∠ADC = 110° because it is double of ∠ADE.

Since AB║CD and AD║BC, the two sets of parallel lines means this shape is a parallelogram. In parallelograms, <u>opposite angles have equal measures</u>.

∠ADC = ∠CBE = 110°

All quadrilaterals have a sum of angles 360°. Since ∠DCB = ∠BAD and we know two of these other angles are each 110°:

360° - 2(110°) = 2(∠DCB)

∠DCB = 140°/2

∠DCB = ∠BAD = 70°

∠DCB was bisected by EC, which makes each divided part half.

∠DCE = ∠BCE = (1/2)(∠DCB)

∠DCE = ∠BCE = (1/2)(70°)

∠DCE = ∠BCE = 35°

All triangles' angles sum to 180°.

In ΔBCE, ∠BCE = 35° and ∠CBE = 110°.

∠CEB = 180° - (∠BCE + ∠CBE)

∠CEB = 180° - (35° + 110°)

∠CEB = 55°

Therefore m∠CEB is 55°.

5 0
3 years ago
What is the unit rate of a 13 ounce of package of pustachios cost $5.99
Klio2033 [76]
5.99 ÷13 =0.46
the unit rate is about 0.46 per ounce
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