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rusak2 [61]
3 years ago
8

What is the product? (5r + 2)(3r − 4)

Mathematics
1 answer:
Anarel [89]3 years ago
6 0
Distribute the first set of parenthesis 

<span><span>15<span>r<span><span>​2</span><span>​​</span></span></span>−20r+6r−8</span><span>
Combine like terms

</span><span><span>15<span>r<span><span>​2</span><span>​​</span></span></span>+(−20r+6r)−8</span><span>
Simplify your answer

</span><span>15<span>r<span><span>​2</span><span>​​</span></span></span>−14r−8

*Answer is </span>15r^2​​−14r−8*<span><span>
</span></span>
</span></span>
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John drove 450 miles in 8 hours. he averaged 50 miles per hour on the highway and 60 miles per hour on the turnpike. how many ho
Alexeev081 [22]
Total distance John drove=450 miles
total time=8 hours
let the number of hours he drove on highway be x, number of hours he drove on turnpike will be (8-x) hours
since
distance=speed*time
distance traveled in highway=50x
distance traveled in turnpike=60(8-x)
thus the total distance will be:
50x+60(8-x)=450
simplifying the above
50x+480-60x=450
-10x=450-480
-10x=-30
thus
x=3 hours
Thus he drove on highway for 3 hours.
3 0
4 years ago
Need help with my problem of the day it’s confusing I’m not good at math :| HELP
alex41 [277]

Answer:

7:36

Step-by-step explanation:


4 0
3 years ago
Stefan sells Jim a bicycle for $175 and a helmet for $17. The total cost for Jim is 160% of what Stefan spent originally to buy
Nady [450]

Answer:

Stefan spend $120 originally.

Stefan made $72 by selling bicycle and helmet to Jim.

Step-by-step explanation:

Given:

Cost of bicycle = $175

Cost of Helmet = $17

Percent of total cost of Jim = 160% of original cost of Stefan

We need to find the Amount Stefan spend originally and money he made by selling the bicycle and helmet to Jim.

Solution:

Let the Amount Stefan spend originally be 'x'.

Total Cost of Jim is equal to sum of Cost of bicycle and Cost of Helmet.

framing in equation form we get;

Total Cost of Jim = 175+17 =\$192

Now we know that;

Total Cost of Jim is equal to 160% of  Amount Stefan spend originally.

framing in equation form we get;

192 = \frac{160}{100}\times x\\\\192 =1.6x

Dividing both side by 1.6 we get;

\frac{192}{1.6}=\frac{1.6x}{1.6}\\\\x= \$120

Hence Stefan spend $120 originally.

Now we can say that;

Money Stefan made is equal to Money Stefan spend originally minus Total Cost of Jim.

framing in equation form we get;

Money Stefan made = 192-120 =\$72

Hence Stefan made $72 by selling bicycle and helmet to Jim.

7 0
3 years ago
What is the length of the unknown side of the right triangle? (1 point)
Angelina_Jolie [31]
C, the answer is C.. trust me
7 0
3 years ago
Gabbys piggy bank contains nickels and dimes worth $4.90 if she has 66 coins in all how many of each does he have
Serhud [2]
This would be 32 Dime totaling $3.20 an 34 nickles for 1.70

34*5+170 aka 1.70
32*=320  aka 3.20
3.20+1.70+4.90

8 0
3 years ago
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