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krek1111 [17]
3 years ago
7

PLEASE DO NUMBER 1 SHOW WORK TOO PLEASE

Mathematics
1 answer:
kirill [66]3 years ago
6 0

Answer:

A) False - not a right angle

B) True - it is a right angle

C) True - it is a right angle

D) False-not a right angle

Step-by-step explanation:

A) a*a+b*b=c*c (Asquared+Bsquared=C squared)

    2*2+ 3*3 = 4*4

   4+9=16

    13 does not equal 16

B) 5*5+12*12=13+13

  25+144=169

  169=169 - True

C) 3*3+4*4=5*5

    9+16=25

     25=25 (True)

D) 4+ Root of 3 = Root of 19

    False - square root of a prime number is irrational

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Write an equation of the line containing the given point and perpendicular to the given line.
Tresset [83]

Answer:

Step-by-step explanation:

The equation of a straight line can be represented in the slope intercept form as

y = mx + c

Where

m = slope = (change in the value of y on the vertical axis) / (change in the value of x on the horizontal axis)

The equation of the given line is

9x+7y=4

7y = 4 - 9x = -9x + 4

y = -9x/7 + 4/7

Comparing with the slope intercept form, slope = -9/7

If the line passing through the given point is perpendicular to the given line, it means that its slope is the negative reciprocal of the slope of the given line.

Therefore, the slope of the line passing through (7,-4) is 7/9

To determine the intercept, we would substitute m = 7/9, x = 7 and y = - 4 into y = mx + c. It becomes

- 4 = 7/9×7 + c = 49/9 + c

c = - 4 - 49/9

c = - 85/9

The equation becomes

y = 7x/9 - 85/9

6 0
3 years ago
I need help please.
Westkost [7]

Answer:

A) 2.5

Step-by-step explanation:

6(2y - 1)-2(4y)=4 \\ 12y - 6 - 8y = 4 \\ 12y - 8y = 4 + 6 \\ 4y = 10 \\ y =  \frac{10}{4}  \\ y = 2.5

7 0
3 years ago
Jameel Alharbi deposited $1,500 in a savings account that earns 5% compounded quarterly. He made no other deposits or withdrawal
Vikki [24]

Answer:

The amount in the account at the end of the 2nd quarter is $1537.73 ⇒ 2nd answer

Step-by-step explanation:

* Lets revise the compound interest

- Compound interest can be calculated using the formula

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Where:

• A = the future value of the investment, including interest

• P = the principal investment amount (the initial amount)

• r = the annual interest rate (decimal)

• n = the number of times that interest is compounded per unit t

• t = the time the money is invested for

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# P = $1500

# r = 5/100 = 0.05

# n = 4 ⇒ quarterly compound

# t = 1/2 ⇒ two quarters means 1/2 year

∴ A = 1500(1 + 0.05/4)^(4 × 1/2) = $1537.73

* The amount in the account at the end of the 2nd quarter is $1537.73

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Step-by-step explanation:

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