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IrinaK [193]
3 years ago
15

Justin was looking for a birthday card for his sister. There were 9 funny cards, 7 serious cards, and 5 musical cards. How many

choices does Justin have for a birthday card? A. 21 B. 68 C. 80 D. 315
Mathematics
2 answers:
madam [21]3 years ago
5 0
Just add.  7 + 9 + 5 = 21  So the answer is A.21
sattari [20]3 years ago
4 0
The answer is A. 21. Hope this helps! Mark brainliest!
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Solve 3x² + 4x = 2. (2 points)
uysha [10]

Answer:

Step-by-step explanation:

As it is a second order equation, it means that it has two possible answers and they are x_1 and x_2.

The famous quadratic formula for solving any second order equation is the following:

x_{1} = \frac{-b + \sqrt{b^2 - 4 ac}}{2a}\\x_{2}=\frac{-b - \sqrt{b^2 - 4 ac}}{2a}

Where a is the coefficient of x^2, b is the coefficient of x, and c is the free term. In other words,

a = 3\\b=4\\c=-2

as the equation should be in the following form:

a x^2 + bx+c = 0

Therefore the possible answer should be the following,

\frac{-4 + \sqrt{4^2 - 4*3*(-2)}}{2*3}=\frac{-4 +\sqrt{16 + 24}}{6} =\frac{-4 + \sqrt{40}}{6}=\\ \frac{-4 + \sqrt{4*10}}{6} = \frac{-4 + 2\sqrt{10}}{6}\frac{2*(-2 + \sqrt{10})}{2*3} = \frac{-2 + \sqrt{10}}{3}

by dividing the numerator and denominator by 2, we can deduce the following,

6 0
2 years ago
Building a is 271 meters taller than building
kvv77 [185]

Let a and b represent the heights of the corresponding buildings (in meters).

... a = b +271 . . . . . . . a is 271 meters taller than b

... 2b -a = 211 . . . . . . if a is subtracted from twice b, the result is 211

Use the expression for a in the first equation to substitute for a in the second.

... 2b - (b+271) = 211

... b = 482 . . . . . . . . . . . simplify and add 271

... a = b +271 = 753

Building a is 753 meters tall; building b is 482 meters tall.

4 0
3 years ago
Which expression is equivalent to this expression? 3/4(4h – 6) A. 3h – 9/2 B. 4h + 9/2 C. 3h – 6 D. 4h + 6
djyliett [7]

Answer:

A. 3h – 9/2 B.

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
PLSSS HELP!!! What is the measure of angle x???
bixtya [17]

DBH make a triangle.

The three inside angles of a triangle need to equal 180

H = 180 - B - D

H = 180 - 39 - 36 = 105

H and X make a straight line that equals 180 degrees

X = 180 - H

X = 180 - 105 = 75 degrees.

5 0
3 years ago
Find the sum of 0.482 and 482.3152
Airida [17]

Answer:482.7972

Step-by-step explanation:

7 0
3 years ago
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