1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alex17521 [72]
3 years ago
7

7a = 28 Is a=21 a solution? yes or no

Mathematics
2 answers:
bagirrra123 [75]3 years ago
4 0
No, because 7 x 21 is 147.
vovangra [49]3 years ago
3 0

Answer:

No

Step-by-step explanation:

No because if a = 21, then 7 * 21 = 147 and 147 is not 28.

You might be interested in
What’s 10 to the power of 2÷25×20+4 divided divided by 2-14
slamgirl [31]
Okay my calculator now says it's 68.
7 0
3 years ago
In the diagram, ABCD is a part of a right angled triangle ODC. If /AB/= 6 cm,
Andreas93 [3]

Answer:

1) 13.3 cm

2) 48.3 cm

Step-by-step explanation:

1) Right angled triangle ODC and right angled triangle OAB are similar because AB//DC. The two triangles have the same proportion and are equiangular (having equal angles) but have different lengths.

Let OB = x, OC = OB + BC = x + 8

Therefore:

\frac{OC}{OB}=\frac{DC}{AB}  \\\frac{x+8}{x}=\frac{15}{6}\\15x=6(x+8)\\15x=6x+48\\15x-6x=48\\9x=48\\x=5.3\ cm

The height of triangle ODC = OC =  x + 8 = 5.3 + 8 = 13.3 cm

2) Using Pythagoras theorem:

OD² = OC² + DC²

OD² = 13.3² + 15²

OD² = 401.89

OD = √401.89 = 20 cm

2) perimeter of triangle ODC = OD + OC + DC = 20 + 13.3 + 15 =48.3 cm

3 0
3 years ago
Match the term with the definition.
Bingel [31]

Answer:

A. Perpendicular Lines

B. Circle

C. Angle

D. Plane

E. Parallel Lines

Hope this helped! Mark as Brainliest Please! :)))

Step-by-step explanation:

8 0
3 years ago
2 doctors is x % of 25 doctors
White raven [17]

Answer: 8% is x

Step-by-step explanation:

3 0
2 years ago
Can someone please help me... I am totally confusedd!!!
Bas_tet [7]
The length would be 6
3 0
4 years ago
Other questions:
  • Which expression shows quotient of n and 4
    15·1 answer
  • Write 19,000,000,000 in scientific notation
    5·1 answer
  • PLSSS HELPFind the next term of the sequence. 1, 8, 27, 64, ..
    13·2 answers
  • What categories does the the following number belong in? -17
    8·1 answer
  • jose drives 65 miles per hour when he travels.sherry drive 450 miles in 9 hours. which driver has a faster rate of change
    11·2 answers
  • Plz answer this is due today​
    11·1 answer
  • Can someone help me ?!
    12·1 answer
  • Labron makes $100 per week and takes no vacation during the entire year. His friend, Jordan, makes $4800 per year at the same we
    12·2 answers
  • A house on the market was valued at $364,000. After several years, the value decreased by 7%. By how much did the house's value
    13·1 answer
  • Find the circumference
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!