(a) 95 = (x+7)*(x-7)

(b) 95 = (x+7)*(x-7)
Expand the brackets:
95 = x² -7x + 7x -49 = x² - 49
Subtract x² from both sides:
95-x² = -49
Subtract 95 from both sides:
-x²=-49-95
-x²= -144
Divide both sides by -1 to get rid of the negative numbers:
-x²/-1=-144/-1
x²=144
Take the square root of 144:
x = ± squareroot of 144
x = 12 or -12
x = 12 because you cannot have a negative age so Trina is 12 years old.

7 0

3 years ago

a 5th grade volleyball team scored 32 points in one game. of those points 2/8 were scored in the second half. how many points we

Degger [83]

Answer:

Number of points scored in the first half of the match is 24 points.

Step-by-step explanation:

Total point scored in the volleyball game = 32

Let us assume the points scored in the first half = m

and the point scored on the second half = 2/8 of (Total points)

= $\frac{2}{8} \times 32 = 8$

⇒ The number of points s cored in the second - half = 8 points

Now, Points in FIRST half+ Points in SECOND half= Total Points

⇒ m+ 8 = 32

or, m = 32 - 8 = 24

⇒ m = 24

Hence, the number of points scored in the first half is 24 points.

4 0

3 years ago