Please help

a = 12 yd

Step-by-step explanation:

From the pythagoras theorem

(hypotenuse)^2 = side^2 + side^2

20^2 = 16^2 + a^2

400 = 256 ^ a^2 subtract 256 from both sides

144 = a^2 the square root of 144 is 12

12 = a

i wish i could you, i have no idea how to answer this

step-by-step explanation:

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places