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Reptile [31]
3 years ago
6

Tìm cực trị của hàm số z(x,y)=x^{3}+y^{3}+3xy-30

Mathematics
1 answer:
gregori [183]3 years ago
3 0

Answer:

Hence, MEAN OF FIRST FIVE COMPOSITE NOS IS 7.5

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Sara borrowed $5,000 from her father at a simple interest rate of 12.5% per year. Over a two - year period, she made equal month
Olin [163]

The formula for simple interest is:

A = P(1+rt)

Where P = amount borrowed

r = interest rate

t = time of loan


A = 5000(1 + 0.125*2)

A =6,250

The total amount she paid back was $6,250


For her monthly payment divide total paid back by 24 months ( 2 years = 24 months)


6250 / 24 = 260.42


Her monthly payment was $260.42

8 0
3 years ago
Read 2 more answers
In the figure, angle ABC and angle ADB are each right angles. Additionally, AC = 17.8 units and AD = 5 units. What is the length
Marizza181 [45]

Answer:

DB = 8

Step-by-step explanation:

Δ ADB and Δ BDC are similar so ratios of corresponding sides are equal, that is

\frac{DB}{DC} = \frac{AD}{BD} , substitute values

\frac{DB}{17.8-5} = \frac{5}{BD}

\frac{DB}{12.8} = \frac{5}{BD} ( cross- multiply )

DB² = 64 ( take the square root of both sides )

DB = \sqrt{64} = 8

7 0
3 years ago
Read 2 more answers
Write the following decimal number in its equivalent fraction form. Show all work for full credit. 0.225
zalisa [80]
Rewrite the decimal number as a fraction with 1 in the denominator

0.225=0.22510.225=0.2251

Multiplying by 1 to eliminate 3 decimal places, we multiply top and bottom by 103 = 1000

0.2251×10001000=2251000


7 0
4 years ago
Read 2 more answers
Lucy drove 300 miles in 10 hours. On average, how fast did she drive in hours per
Simora [160]

Answer: 30 miles per hour

Step-by-step explanation:

Speed = distance / time

= 300 / 10

= 30 miles per hour

7 0
4 years ago
138) Amanda and Jenny are selling fruit for a school fundraiser. Customers can buy small boxes of oranges and large boxes of ora
Alex17521 [72]
This is a system of equations problem, so we need two equations to represent each case:
5s+5L=155
10s+12L=346

Now we isolate one of the variables.

5s = 155 - 5L
s = 31 - L

Now we substitute s in the other equation with this equation.

10(31-L) + 12L = 346
310-10L + 12L = 346
2L = 36
L = $18

Now to find s we need to plug L into one of the equations.

10s + 12(18) = 346
10s + 216 = 346
10s = 130
s = $13

A large box costs$18 and a small box costs $13

Hope this helps.
6 0
3 years ago
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