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Fynjy0 [20]
3 years ago
6

Matty is always on the playground his favorite coins to collect or nickels and dimes. He has found $6.20, or $72 total nickels a

nd dimes. Write and algebraically solve a system of equations to figure out how many nickels he has and how many dimes he has.
Mathematics
1 answer:
nadya68 [22]3 years ago
8 0

Answer:

Matty is a bit of a weirdo you know what i mean

Step-by-step explanation:

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3. Given this quadratic equation, 2x2 - x - 28 = 0,
JulijaS [17]

Answer:

a) (2x+7)(x-4)

b) x = -7/2 and x = 4

Step-by-step explanation:

a) (2x  ?)(x  ?)

set up the above and considered factors of 28 that, when paired with 2, would give me -1x and -28  → (1·28, 2·14, 4·7)

after trial-and-error, found that 4 and 7 worked (used un-FOIL)

b) 2x + 7 = 0

2x = -7

x = -7/2

*********

x-4 = 0

x = 4

4 0
2 years ago
The shadow of a tree measures 25 feet from its base. The angle of elevation to the Sun is 31º How tall is the tree? Round your a
grigory [225]

Answer: 15 feet

Step-by-step explanation:

Hi, since the situation forms a right triangle (see attachment) we have to apply the next trigonometric function.  

Tan α = opposite side / adjacent side

Where α is the angle of elevation to the sun, , the opposite side (x) is the height of the tree, and the adjacent side is the length of the shadow.

Replacing with the values given:  

Tan 31 = x /25

Tan 31 (25) =x

x = 15 feet

Feel free to ask for more if needed or if you did not understand something.  

4 0
3 years ago
Solve. 14/n+7=10/n-4<br><br> N=5.25<br> N=3.5<br> N=31.5<br> N=30
Ilya [14]

Answer:

n=31.5

Step-by-step explanation:

The given question is:

\frac{14}{n+7}=\frac{10}{n-4}

Cross multiply to get:

14(n-4)=10(n+7)

Expand the parenthesis:

14n-56=10n+70

Group similar terms:

14n-10n=70+56

Combine the like terms

4n=126

Divide both sides by 4

n=\frac{126}{4}

n=31.5

5 0
3 years ago
Solve for 2.<br> - 6x + 2x = -4<br> 6<br> 4<br> 1<br> -6
NNADVOKAT [17]
The answer is c) x=1
6 0
3 years ago
Read 2 more answers
How do u add 10 to 2 digits numbers
SVETLANKA909090 [29]
It depends. Multiples of 10 are:
10, 20, 30, 40, 50...........
And a 2 digit number can be anything between 10 and 99.

To comment: Rodney would have 39 pieces of fruit. 
4 0
2 years ago
Read 2 more answers
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