Dakota and Howie went out for pizza. Dakota ate 1/4 of the pizza
Howie ate 3/5 of the pizza.
How much did they eat together

17/20 of the pizza.

Step-by-step explanation:

First, we need to give these two fractions a common denominator, to do this, we need to find the LCM of 4 and 5. The LCM of 4 and 5 is 20. Now, we multiply 1/4 by 5/5 and mulitply 3/5 by 4/4. When we do this, we get 5/20 and 12/20. Now, we add those fractions and simplify (if we can). When we add them (don't add the bottom numbers), we get 17/20. We can't simplify this, so we just leave it as it is. I hope this helped!

the answer is c.

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