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USPshnik [31]
2 years ago
5

Use the quadratic formula to solve x^2 + 3^x - 28 = 0

Mathematics
1 answer:
Mama L [17]2 years ago
3 0

Step-by-step explanation:

x^2 + 3x - 28 = 0

x^2 - 7x + 4x - 28 = 0

x(x-7) + 4(x-7) = 0

(x+4)(x-7)= 0

x+4=0 or x-7=0

x= -4 or x=7

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What is the value of b when the expression-6.2x + b is equivalent to -3.1(2x - 3)
Rudik [331]

Answer:

- 6.2x + b \equiv - 3.1(2x - 3) \\  - 6.2x + b =  - 6.2x + 9.3 \\ b = 9.3

8 0
3 years ago
Is negative twenty two over nine an irrational number
Nutka1998 [239]

No.

-22/9 is a fraction with integer numerator and denominator. That is the definition of a rational number. When written in decimal form, it is an infinitely repeating decimal with a single repeating digit: 4. Any repeating decimal is a rational number. It is only irrational if it doesn't repeat.

6 0
3 years ago
Please answer correctly math problemo
MrMuchimi

Answer:

38

Step-by-step explanation:

We have to substitute x with 2 and y with 4

when the sign of a operation is not expressed it means that the operation is a

multiplication

So we have

3*2 + 2*(4)^2

6 + 2*(16)

6 + 32

38

4 0
3 years ago
ASE
eimsori [14]

Answer:

128 deg

Step-by-step explanation:

The sum of the measures of the angles of a polygon of n sides is

(n - 2)180

A trapezium has 4 sides, so the sum of the measures of the angles is

(4 - 2)180 = 2(180) = 360

<em>m<CBE + m<C + m<D + m<DEB = 360</em>

Angles ABC and CBE are a linear pair so the sum of their measures is 180 deg.

m<ABC + m<CBE = 180

115 + m<CBE = 180

m<CBE = 65

m<C = x

m<D = 90

Angles DEB and DEF are a linear pair so the sum of their measures is 180 deg.

m<DEB + m<DEF = 180

m<DEB + m<103 = 180

m<DEB = 77

<em>m<CBE + m<C + m<D + m<DEB = 360</em>

65 + x + 90 + 77 = 360

x + 232 = 360

x = 128

Answer: 128 deg

<em />

3 0
3 years ago
Read 2 more answers
What fraction of a day is 45 minutes
Sloan [31]

To be able to determine what fraction of a day is 45 minutes, let's first determine how many minutes are there in a day.

1 day

4 0
1 year ago
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