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Kisachek [45]
2 years ago
5

Do both of them for 50 points

Mathematics
1 answer:
erastovalidia [21]2 years ago
5 0

Answer:

1) 5.44, 2) 3.9

Step-by-step explanation:

1) a/b + 2b - a^2 when a = 1.4 and b = 0.2

plug in the values:

1.4/0.2 + 2(0.2) - (1.4)^2 = 7 + 0.4 - 1.96 = 5.44

2) a[b-2c]^3 - d/e when a = 2, b = -0.75, c = -1, d = 0, e = -12 5/7 (rewritten to -89/7 = 12.71)

again, plug in the values:

2[-0.75-2(-1)]^3 - 0/12.71 = 2[1.25]^3 - 0 = 2[1.95] = 3.9

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Factor the quadratic equation below to reveal the solutions. X^2+4x-21=-9
a_sh-v [17]

Answer:

x = 3 and x = -7

Step-by-step explanation:

The given quadratic equation is x^2+4x-21=0. We need to find the solution of this equation.

If the equation is in the form of ax^2+bx+c=0, then its solutions are given by :

x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}

Here, a = 1, b = 4 and c = -21

Plugging all the values in the value of x, such that :

x=\dfrac{-b+ \sqrt{b^2-4ac} }{2a},\dfrac{-b- \sqrt{b^2-4ac} }{2a}\\\\x=\dfrac{-4+ \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)},\dfrac{-4- \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)}\\\\x=3, -7

So, the solutions of the quadratic equation are 3 and -7.      

6 0
3 years ago
25 less than twice a number is equal to the number. What is the number?
belka [17]

Step-by-step explanation:

x = the number

2x - 25 = x

2x = x + 25

x = 25

8 0
2 years ago
A vending machine sells chips for $0.50 and candy bars for $1.00. If Jim spent $5.50 on snacks in the machine over the course of
m_a_m_a [10]

Answer:

can't be determined

Step-by-step explanation:

we would need to know the total number of bars/chips he brought

5 0
2 years ago
What is the volume of the triangular prism​
mestny [16]

Answer:

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Step-by-step explanation:

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  • V = 1/2(7*8)*11 = 308 cm³
3 0
3 years ago
Read 2 more answers
What is the answer 9c-5=13?
riadik2000 [5.3K]
C is 2 because you have to move the 5 so you add 5 to 13 which is 18 then divide both sides by 9 so it's 2
3 0
2 years ago
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