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butalik [34]
2 years ago
12

Kyle Eunice has 78 blocks. She stacked it in such a way that the topmost row has one block, the row below it has two blocks, and

row below it has three blocks, and so on. How many rows does this stack have?
Mathematics
1 answer:
myrzilka [38]2 years ago
6 0

Answer:

12

Step-by-step explanation:

1

2

3

4

5

6

7

8

9

10

11

12

1+2+3+4+5+6+7+8+9+10+11+12=78

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This equation shows how the number of cookies Jonah can bake is related to the amount of flour he has. c = 8f The variable f rep
Romashka [77]

Answer:

c = 24

Step-by-step explanation:

8*3=c

4 0
2 years ago
Find sin 2a and cot 2a:
geniusboy [140]

Answer:

sin(2\alpha )=2(\frac{5}{12})(\frac{12}{13})=\frac{10}{13}\\cot(2\alpha ) = \frac{16511}{18720}

Step-by-step explanation:

\text{if } cos(\alpha)=\frac{12}{13}\\\text{That must mean we have a triangle with base 12, and hypotenuse 13.}\\\text{Using Pythagoras, we can determine the base of the triangle must be 5.}\\a^2+b^2=c^2 \text{, where c is the hypotenuse and a, b are the two other sides.}\\c^2-b^2=a^2\\\sqrt{c^2-b^2}=a\\\sqrt{13^2-12^2}=\sqrt{169-144}=\sqrt{25}=5\\\text{Therefore, }sin(\alpha) = \frac{5}{12}\\sin(2\alpha)=2sin(\alpha )cos(\alpha)\\\text{(From double angle formulae identities)}\\

sin(2\alpha )=2(\frac{5}{12})(\frac{12}{13})=\frac{10}{13}\\cos(2\alpha )=cos^2(\alpha)-sin^2(\alpha)\\cos(2\alpha )=(\frac{12}{13})^2-(\frac{5}{12})^2=\frac{16511}{24336}\\cot(2\alpha)=\frac{cos(2\alpha)}{sin(2\alpha)}=\frac{\frac{16511}{24336}}{\frac{10}{13}}=\frac{16511}{18720}

8 0
3 years ago
What is the y-value when x equals 28? y=310-25(x)
Fofino [41]

Answer:

-390   PLEASE GIVE BRAINLIEST

Step-by-step explanation:

y = 310 - 25(28)

y = 310 - 700

y = -390

5 0
3 years ago
I need help with #8
NikAS [45]
I drew it out. Hope this helps.

7 0
3 years ago
Question one* w•63=11<br>question two* 17=t•90
umka2103 [35]
#1 - 11/63
#2 - 17/90
3 0
3 years ago
Read 2 more answers
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