The salary of a man is increased by 18% annually. If his present salary is 345,000, what was it a year ago?​

$292,372.88

Step-by-step explanation:

Let's say we want to increase some number x by 18%. We know we can't just multiply x by 18% since , which doesn't make sense if we are trying to increase x. Instead, we must multiply by 118%. This is because we want to add 18% of x back onto x. This is exactly like saying , since that expression is equal to .

Now, let's say that some number y is equal to our number x that was increased by 18%. Then, we know that from our equation above. If we solve this equation for x, we find that .

Now, notice that in this equation, y could represent the man's salary this year, and x could represent his salary last year. This is because his salary increases by 18% annually, so y is simply his last year's salary, x, increased by 18% ().

Finally, we can easily just plug in our numbers for y and x in our equation that's solved for x: , and we find our answer.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet