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katen-ka-za [31]
3 years ago
8

Solve for x.

Mathematics
1 answer:
xenn [34]3 years ago
5 0

Answer:

a \: \:  x =  \frac{ -1 ±  i\sqrt{139}}{14}

Explanation:

Since this is unfactorable, use the Quadratic Formula:

x =  -b ± \frac{ \sqrt{ {b}^{2} - 4ac}}{2a}

Now, take the information and input it:

-1 ± \frac{ \sqrt{1 - 4(7)(5)}}{2(7)} \\  \\ -1 ± \frac{ \sqrt{ -139}}{ 14} = \frac{-1 ±  i\sqrt{139}}{14}

I am joyous to assist you anytime.

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Answer Quick 50 Points! <br><br> Names of those Quadrilaterals
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C square
E paraellolgram
F trapezoid
A rhombus
B rectangle I can’t see it well

Hope this helps
4 0
3 years ago
Read 2 more answers
6(-p+8)= -6p + 12<br> Can someone help me please
Leno4ka [110]

Multiply the bracket by 6

6(-p+8)= -6p + 12

-6p+48= -6p+12

Move -6p from right side to left side

Sign changes from -6p to +6p

-6p+6p+48= -6p+6p+12

48= 12 ( No solution )

Answer : No solution

4 0
3 years ago
Which of the following sets of numbers could represent the three sides of a right triangle?
Natalija [7]

Answer:

{42,56,70}

Step-by-step explanation:

a^2 + b^2 = c^2

42^2 = 1764

56^2 = 3136

70^2 = 4900

3136 + 1734 = 4900

6 0
2 years ago
Read 2 more answers
O is the centre of the circle, EF is a tangent, angle BCE = 28°, angle ACD = 31°
andriy [413]

Answer

a. 28˚

b. 76˚

c. 104˚

d. 56˚

Step-by-step explanation

Given,

∠BCE=28°  ∠ACD=31°  &  line AB=AC .

According To the Question,

  • a. the angle between a chord and a tangent through one of the end points of the chord is equal to the angle in the alternate segment.(Alternate Segment Theorem) Thus, ∠BAC=28°

  • b. We Know The Sum Of All Angles in a triangle is 180˚, 180°-∠CAB(28°)=152° and ΔABC is an isosceles triangle, So 152°/2=76˚

        thus , ∠ABC=76° .

  • c. We know the Sum of all angles in a triangle is 180° and opposite angles in a cyclic quadrilateral(ABCD) add up to 180˚,

Thus, ∠ACD + ∠ACB = 31° + 76° ⇔ 107°

Now, ∠DCB + ∠DAB = 180°(Cyclic Quadrilateral opposite angle)

∠DAB = 180° - 107° ⇔ 73°

& We Know, ∠DAC+∠CAB=∠DAB ⇔ ∠DAC = 73° - 28° ⇔ 45°

Now, In Triangle ADC Sum of angles in a triangle is 180°

∠ADC = 180° - (31° + 45°)  ⇔  104˚

   

  • d. ∠COB = 28°×2 ⇔ 56˚ , because With the Same Arc(CB) The Angle at circumference are half of the angle at the centre  

For Diagram, Please Find in Attachment  

4 0
3 years ago
A dozen box of bagels costs $4.98. Because of inflation the price increases by 4% a year.
Olenka [21]
A=p (1+r)^t
A future value
P present value 4.98
R rate 0.04
T time

After 3 years
A=4.98×(1+0.04)^(3)
A=5.60

7.50=4.98 (1.04)^t
Solve for t
T=log(7.50÷4.98)÷log(1.04)
T=10 years

Hope it helps:-)
3 0
3 years ago
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