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Arada [10]
2 years ago
9

Identify the solutions to the quadratic equation. Check all that apply. x2 + 4x - 21 = 0

Mathematics
2 answers:
Vika [28.1K]2 years ago
8 0

Answer:

C and D

Step-by-step explanation:

(X-3)(X+7)=0

X-3=0   X+7=0

X=3  X=-7

soldier1979 [14.2K]2 years ago
5 0

Answer:

6, -7 ; C and D

Step-by-step explanation:

(-4 +/- √16+84)/2=x

(-4 +/- 10)/2=x

x=6/2=3, or x=-14/2= -7

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A purse contains $2.95 in quarters and dimes. The number of quarters exceeds the number of dimes by 2. Find the number of quarte
abruzzese [7]

Answer:

9 quarters and 7 dimes

Step-by-step explanation:

1 quarter = $0.25

1 dime = $0.10

9 (0.25) = $2.25

7 (0.10) = $0.70

2.25 + 0.70 = $2.95

4 0
3 years ago
I WILL GIVE 20 POINTS TO THOSE WHO ANSWER THIS QUESTION RIGHT NOOOO SCAMS AND EXPLAIN WHY THAT IS THE ANSWER
saw5 [17]

Answer:

Step-by-step explanation:

isosceles trapezoid = congruent sides in pairs and the same for the angles

<h2><u><em>angle 1 = 32°</em></u></h2><h2><u><em>angles 2 & 3 = 148°</em></u></h2>

the sum of the interior angles is 360°

so angle 1 = 32°

angles 2 and 3

(360 - 32 - 32) :2 = 148°

check

32 + 32 + 148 + 148 = 360°

the answer is good

7 0
2 years ago
What is the measure of angle y in this figure?<br><br> Enter your answer in the box.<br><br> y=__°
Inga [223]

Answer:

sum of angles at a point is equal to 360

so, 360= 163+ x°+ y°+z°

y°=360-163 -x° - z°

y°=197- x° -z°

7 0
2 years ago
The diagram shows a 3 cm x 5 cm x 4 cm cuboid
Rainbow [258]

Answer:

a) The length of segment AC is approximately 5.83 centimeters.

b) The angle ACD is approximately 34.5º.

Step-by-step explanation:

a) Since AB \perp BC, the length of segment AC is determined by Pythagorean Theorem, that is:

AC = \sqrt{(5\,cm)^{2}+(3\,cm)^{2}}

AC \approx 5.831\,cm

The length of segment AC is approximately 5.831 centimeters.

b) Since AB \perp BC \perp AD, the length of segment AD is determined by this Pythagorean identity:

AD = \sqrt{(3\,cm)^{2}+(5\,cm)^{2}+(4\,cm)^{2}}

AD \approx 7.071\,cm

The angle ACD is determined by the following trigonometric expression:

\cos C = \frac{AC}{CD}

\cos C = \frac{5.831\,cm}{7.071\,cm}

\cos C = 0.825

C = \cos^{-1} 0.825

C \approx 34.448^{\circ}

The angle ACD is approximately 34.448º.

4 0
2 years ago
Which polynomial function has a leading coefficient of3 and roots -4, i, and 2, all with multiplicity 1?
andreyandreev [35.5K]

Answer:

Step-by-step explanation:

f(x) = 3(x + 4)(x – i)(x + i)(x – 2)

7 0
3 years ago
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