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sleet_krkn [62]
2 years ago
6

Mrs. Barlow's math class took a test yesterday. Out of 80 students, 70% of them passed. How many of Mrs. Barlow's students passe

d the test?
A.
24
B.
56
C.
6
D.
2
Mathematics
1 answer:
likoan [24]2 years ago
8 0

Answer:

B.56

Step-by-step explanation:

80x0.70 is 56

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{ y = - 4x-23-4x-3y=13
sleet_krkn [62]

For this case we have the following system of equations:

y = -4x-23\\-4x-3y = 13

We solve by the substitution method:

We substitute the first equation in the second equation:

-4x-3 (-4x-23) = 13

We apply distributive property considering that - * - = +:

-4x + 12x + 69 = 13\\8x + 69 = 13

We subtract 69 from both sides of the equation:

8x = 13-69\\8x = -56

We divide by 8 on both sides of the equation:

x = \frac {-56} {8}\\x = -7

We look for the value of the variable y:

y = -4 (-7) -23\\y = 28-23\\y = 5

Thus, the solution of the system is (x, y): (-7,5)

Answer:

(x, y): (-7,5)

7 0
3 years ago
Solve for r 1/2r-3=3(4-3/2
devlian [24]
1/2r - 3 = 3(4-3/2) -----> Simplify the right side.
1/2r - 3 = 3(1/2) -----> Multiply
1/2r - 3 = 3/2 ----> Add 3 to both sides
1/2r = 6/2 + 3/2
1/2r = 9/2 -----> Divide both sides by 1/2 which is the same as multiplying my 2
r = 18/2
r = 9
Hope this helps!
8 0
3 years ago
Find the surface area of a cone if the diameter of its base is 13.5 feet, and it has a slant height of 16.8 feet. Round to the n
Tresset [83]

The diameter is given which is 13.5feet and radius is half of diameter. Therefore radius = 6.75 feet.

Slant height = 16.8 feet

The formula of surface area of cone is

S = \pi *r(r+l) \\ S = \pi*6.75(6.75+16.8) \\ S =\pi*6.75*23.55 = 499.2 ft^2

Correct option is C

5 0
3 years ago
The product of two given numbers is 126 both of them are divisible by 3 but neither of them is 3.The larger of the two numbers i
Mice21 [21]

I believe the answer is 21

21 × 6 = 126

and both numbers are divisible by 3

4 0
3 years ago
Who's has the most money in the world
Temka [501]

Answer:

Jeff Bezos

Step-by-step explanation:

He is the amazon founder and CEO, He has a net worth of 193.4 billion and ranks the first richest person on earth today

5 0
3 years ago
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