# Taina

Most popular questions and responses by Taina
1. ## math

Rowing. Abby rows 10 km upstream and 10 km back in a total time of 3 hr. The speed of the river is 5km/h. Find Abby’s speed in still water.use five-step problem solving process

2. ## math

15t^2+7t=2 The quadratic formula tells you that the solutions are: t = [-b +/-sqrt (b^2 - 4ac]/ (2a) In this case, a = 15, b = 7 and c = -2 solve the equation for t. What values for t will you get when you substitute the values you listed for a, b, and c

3. ## Math

How many times heavier is a 16 1/2 pound rock than a 10 1/2 pound rock

4. ## math

If a stone is tossed from the top of a 210 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 210, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to

5. ## math

Joe has a collection of nickels and dimes that is worth \$6.20. If the number of dimes was doubled and the number of nickels was decreased by 37, the value of the coins would be \$8.85. How many nickels and dimes does he have?

6. ## math

Use the discriminant to determine whether the following equations have solutions that are: two different rational solutions; two different irrational solutions; exactly one rational solution; or two different imaginary solutions. x2 = 5x + 6

7. ## General Chemistry

Analyze the properties of a sodium atom and a sodium ion. What are the differences in mass, stability, and reactivity that are caused due to the differences between the sodium atom and sodium ion?

8. ## math

Solve by factoring: 2a^2-3a= -5

9. ## algebra

1. In solving the equation (x + 3)(x + 1) = 48, Eric stated that the solution would be x + 3 = 48 => x = 45 or (x + 1) = 48 => x = 47 However, at least one of these solutions fails to work when substituted back into the original equation. Why is that?

10. ## math

Express in terms of i. ã-225 + ã-49

11. ## math

Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this. 8y + 2x = 48 2x = 4y – 12

12. ## algebra

A 125-ft diagonal brace on a bridge connects a support of the center of the bridge to a side support on the bridge. The horizontal distance that it spans is 25 ft longer than the height that it reaches on the side of the bridge. Find the horizontal and

13. ## Factor (Math)

Factor by grouping if possible. z^3+3z^2+7z+21