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Lena [83]
3 years ago
8

Is -7 + 9= 9 + 7 true, false or open

Mathematics
2 answers:
Natasha_Volkova [10]3 years ago
6 0
-7 + 9  \neq  9 + 7

2 \neq 17

When you add a positive number and a negative number, you get a positive, but the number is smaller. If you add two positive numbers, then of course, you're going to get a positive number as an answer. But overall, this is false.
True [87]3 years ago
5 0
That's false -7+9=2 and 7+9=18
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Find the value of x to the nearest tenth.
mafiozo [28]

For this case we have that, by definition of trigonometric relationships of rectangular triangles, the cosine of an angle is given by the division of the leg adjacent to the angle on the hypotenuse of the triangle. According to the figure we have:

Cosine (50) = \frac {6} {x}\\x = \frac {6} {cosine (50)}\\x = 9.3343

Thus, the value of x is 9.3

Answer:

x = 9.3

4 0
3 years ago
Leo is purchasing a bike that is on sale for 30% off. He knows the function that represents the sale price of his bike is c(p) =
Umnica [9.8K]

Answer:

f[c(p)] = 0.784p

Step-by-step explanation:

sales discount = 30%

sales tax = 12%

c(p) = 0.7p where p is the original price

f(c) = 1.12c where c is the sales price of the bike.

f[c(p)] = 1.12(0.7p)

f[c(p)] = 0.784p    Last option.

Assume: p = 100

c(100) = 0.7(100) = 70

f(70) = 1.12(70) = 78.4

f[70(100)] = 0.784(100) = 78.4

7 0
3 years ago
Calculator Active
Black_prince [1.1K]

Answer:

Step-by-step explanation:

length of the third side = Perimeter - ( sum of the length of other two sides}

=15x - 6 - ( 7x-4+3x+2)

=15x-6 -(10x-2)

=15x - 6 - 10x + 2

= 5x - 4

6 0
3 years ago
2. Let Y denote the average starting salary for 2014 U.S. college graduates, measured in dollars. Suppose that the average annua
Dafna11 [192]

Answer:

Average salary: 56

Standard deviation of the salary: 8

Step-by-step explanation:

$56,000 dollars is 56 thousand dollars.

$8,000 is 8 thousand dollars.

The mean is the average. So the average, measured in thousands of dollars, is 56.

The standard deviation is $8,000. So, the standard deviation measured in thousands of dollars, is 8.

5 0
3 years ago
A cylinder has a base area of 64π m2. Its height is equal to twice the radius. Identify the volume of the cylinder to the neares
Maurinko [17]

Answer:

3215 .36 m³ is the required volume.

Step-by-step explanation:

Base area of Cylinder = 64π m²

Height of cylinder is equal to twice the radius .

As we know that ,

★Base Area of Cylinder = πr²

where,

π is taken as 22/7 or 3.14

r is the radius of cylinder

Substitute the value we get

↝ 64 π = πr²

↝ 64 = r²

↝ √64 = r

↝ 8 = r

↝ r = 8 m

Now, it is given that height is equal to twice of radius

Therefore ,

height = 2r = 2×8 = 16 m

★Volume of Cylinder = πr²h

substitute the value we get

↝ volume of Cylinder = 3.14 × 8² × 16

↝volume of Cylinder = 3.14 × 64 × 16

↝volume of Cylinder = 3215 .36 m²

Hence, the required volume of cylinder is 3215 .36 m³.

6 0
3 years ago
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