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Arada [10]
3 years ago
9

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

Mathematics
2 answers:
Vika [28.1K]3 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]3 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 toy plane moves at a constant speed of 2m/s. How long will it travel a distance of 42 meters?
Tpy6a [65]

Answer:

option A. 21 sec

Step-by-step explanation:

Speed = the distance over the time

Given:

Speed = 2 m/s  and distance = 42 m and time = t

So,

2 = 42/t

Solve for t

t = 42/2 = 21 sec.

The answer is option A. 21 sec

7 0
3 years ago
A family prepares an emergency kit for their home. The kit contains 63 gallons of drinking water. The​ family's daily drinking w
mr_godi [17]

Answer:

12 days

Step-by-step explanation:

Total gallons of the family's drinking water needs = gallons consumed by children + gallons consumed by adults

3\frac{1}{2} + 1\frac{3}{4} =

Converting to decimals

3.5 + 1.75 = 5.25 = 5\frac{1}{4}

If there are 63 gallons, the water supply would last for :

63 / 5.25 =12 days

6 0
3 years ago
How many five digit ZIP Codes are possible if the two numbers cannot be zero or a one? (Numbers can repeat)
olga nikolaevna [1]

Answer:

This means 100000 possible zip codes if repeatable

Step-by-step explanation:

5 0
3 years ago
Please help me on this it’s due
olya-2409 [2.1K]
<h3>Answer:  5 cakes</h3>

================================================

Explanation:

Let's start off converting the mixed number 12 & 1/4 to an improper fraction.

a \frac{b}{c} = \frac{a*c+b}{c}\\\\12 \frac{1}{4} = \frac{12*4+1}{4}\\\\12 \frac{1}{4} = \frac{49}{4}\\\\

Do the same for the other mixed number 2 & 1/3.

a \frac{b}{c} = \frac{a*c+b}{c}\\\\2 \frac{1}{3} = \frac{2*3+1}{3}\\\\2 \frac{1}{3} = \frac{7}{3}\\\\

-----------------------

From here, we divide the two fractions. I converted them to improper fractions to make the division process easier.

\frac{49}{4} \div \frac{7}{3} = \frac{49}{4} \times \frac{3}{7}\\\\\frac{49}{4} \div \frac{7}{3} = \frac{49\times 3}{4\times 7}\\\\\frac{49}{4} \div \frac{7}{3} = \frac{7\times 7\times 3}{4\times 7}\\\\\frac{49}{4} \div \frac{7}{3} = \frac{7\times 3}{4}\\\\\frac{49}{4} \div \frac{7}{3} = \frac{21}{4}\\\\

The last step is to convert that result to a mixed number.

\frac{21}{4} = \frac{4*5+1}{4}\\\\\frac{21}{4} = \frac{4*5}{4}+\frac{1}{4}\\\\\frac{21}{4} = 4+\frac{1}{4}\\\\\frac{21}{4} = 5 \frac{1}{4}\\\\

Note that 21/4 = 5.25 and 1/4 = 0.25 to help check the answer.

-----------------------

Therefore, she can make 5 cakes. The fractional portion 1/4 is ignored since we're only considering whole cakes rather than partial ones.

3 0
3 years ago
Need help asap<br>hsjshsuehdue​
Katena32 [7]
My did ask the ppl who make Big Macs
8 0
3 years ago
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