We have been given an equation $w=\frac{3}{2}t-1$ that represents umber of walls, w, that Joe can paint in t hours. We are asked to find the number of hours it will take Joe yo paint 7 walls.

To solve our given problem, we will substitute $w=7$ in our given equation as:

$7=\frac{3}{2}t-1$

Let us solve for t.

$7+1=\frac{3}{2}t-1+1$

$8=\frac{3}{2}t$

$8\cdot\frac{2}{3}=\frac{2}{3}\cdot\frac{3}{2}t$

$\frac{8\cdot2}{3}=t$

$\frac{16}{3}=t$

Therefore, it will take $\frac{16}{3}$ hours Joe to paint 7 walls.

3 0

3 years ago

Can someone help me with this

Over [174]

I think the answer is D, because P is the new price, n is the original price, then you multiply 0.25 by the original price and then subtract it by the original price.

5 0

3 years ago

What two numbers add up to 9 and multiply to -90?

Alik [6]

You solve the equation : t^2 - 9t - 90 = 0 ;
Δ = ( - 9 )^2 - 4 * 1 * ( - 90 ) = 81 + 360 = 441 ;
t1 = ( 9 + $\sqrt{441}$ ) / 2 = 30 / 2 = 15 ;
t2 = ( 9 - $\sqrt{441}$ ) / 2 = -12 / 2 = - 6 ;

The numbers are 15 and - 6 ;

3 0

3 years ago