Step-by-step explanation: 2x+5(y-1) when x=8 and y=5. put x where it belongs, by the 2 and do the same with y, by the -1. and then slove. 2*8= 16 , 5*5= 25-1, then add 16 and 24 together and get 40.

5 0

3 years ago

Find the value of the cosine for ZA.

baherus [9]

Answer:

C. $\frac{8\sqrt{89}}{89}$

Step-by-step explanation:

Cos A = Adj/Hyp

Reference angle = <A

Adjacent side = 8 ft

Hypotenuse = √(8² + 5²) = √89 (pythagorean theorem)

Thus:

$Cos (A) = \frac{8}{\sqrt{89}}$

Rationalize

$Cos (A) = \frac{8 * \sqrt{89}}{\sqrt{89} * \sqrt{89}}$

$Cos (A) = \frac{8\sqrt{89}}{89}$

5 0

3 years ago

21(x+ 50) = 1,071 distributive property include the steps will be marked brainliest

kogti [31]

21(x+ 50) = 1,071

Use distributive property, multiply 21 by both terms inside the parenthesis:

21x + 1,050 = 1,071

Subtract 1,050 from both sides:

21x = 21

Divide both sides by 21:

x = 21/21

x = 1

7 0

3 years ago

Can you add variables with different exponents ​

Can you add variables with different exponents