Answer:
23
Step-by-step explanation:
4r-10=18
4r=28
4r/4=28/4
r=7
2(7)+9=23
Answer:
4.57 * 10^8
Step-by-step explanation:
457,000,000
Imagine there is a decimal point at the end like so
457,000,000.
In order to get to 4.57000000, you need to move the decimal 8 spaces left.
Thus, 457,000,000 in scientific notation is 4.57 * 10^8
Answer:
$150
Step-by-step explanation:
The area of the lawn is 12m so 12 x 12.50 is 150. It would cost $150
Answer:
dimensions are 51x91
Step-by-step explanation:
Assuming that the gym is rectangular in shape, then...
l*w=4641
and 2l+2w=284
We have two variables and two equations so to solve this we plug one equation into another.
Solve for one variable:
l*w=4641
w=4641/l
Plug into the other equation...
2l+2(4641/l)=284
Solve
l*(2l+9282/l)=284
2l^2+9282=284l
2l^2-284l+9282=0
Factor the trinomial:
2(l−51)(l−91)=0
l−51=0 or l−91=0(Set factors equal to 0)
l=51 or l=91
now, lets plug it into one of the equations to find w
51*w=4641
w=91, l=51
or...
91*w=4641
w=51, l=91