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My name is Ann [436]
2 years ago
6

Referring to the Fig. in Question #40, find the unknown length Y.

Mathematics
2 answers:
icang [17]2 years ago
7 0

Answer:

tan30°=7/x

\frac{1}{ \sqrt{3} }  =  \frac{7}{x }  \\ x = 7 \sqrt{3}

cos30°=x/y

\frac{ \sqrt{3} }{2}   =  \frac{7 \sqrt{3} }{y}  \\  \\ 7 \sqrt{3}  \times 2 =  \sqrt{3}  \times y \\ \frac{7 \sqrt{3 }  \times 2}{ \sqrt{3} }  = y \\7 \times 2 = y \\ 14 = y

tell me if it's wrong.

dolphi86 [110]2 years ago
3 0
Above answer is correct
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The length of a rectangular painting is 3 inches longer than its width. If the diagonal is 15 inches long, what is the length of
vladimir2022 [97]
A^2+b^2= 15^2

b=a-3

Use substitution
a^2+(a-3)^2= 225
a^2+a^2-6a+9=225
2a^2-6a=-216
2a^2-6a+216=0

2(a^2-3a+108)
2(a-12)(a+9)

(a-12)=0
a=12
(a+9)=0
a=-9
A is -9 or 12, but since an object can't have a negative length or width, a must be 12.

Plug this value of a in.
b=(12)-3
b=9

Final answer: Length=9, width=12
8 0
3 years ago
Read 2 more answers
Subtract 5m + 2 from 9m
algol [13]
It would be: 9m - 5m + 2
= 4m + 2

Hope this helps!
6 0
3 years ago
What is -0.8 as a fraction?
stira [4]

Answer:

-\frac{4}{5}

Step-by-step explanation:

There is not much that can be done to figure out how to write 0.8 as a fraction, except to literally use what the decimal portion of your number, the .8, means.

Since there are 1 digits in 8, the very last digit is the "10th" decimal place.

So we can just say that .8 is the same as 8/10.

The fraction is not reduced to lowest terms. We can reduce this fraction to lowest  terms by dividing both the numerator and denominator by 2.

Why divide by 2? 2 is the Greatest Common Divisor (GCD)  or Greatest Common Factor (GCF) of the numbers 8 and 10.

So, this fraction reduced to lowest terms is  4/5

So your final answer is: 0.8 can be written as the fraction 8/10 simplified to 4/5

6 0
3 years ago
Read 2 more answers
Someone please help me go get BRAILIEST!!!!!!!!!
Oliga [24]
This answer would be letter C because if you simplify 49/56 divided by seven you get a grand total of 7/8.
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3 years ago
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UkoKoshka [18]

Answer:

A

Step-by-step explanation:

3 0
2 years ago
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