The height of a rectangle is multiplied by 4. which of the following describes the effect of this change on the area?
the area is multiplied by 16.
the area is multiplied by 8.
the area is multiplied by 4.
the area is multiplied by 2.

Area is multiplied by 4.

Step-by-step explanation:

The area of rectangle with dimensions h and l are h*l.

If we multiply the height,h, by 4 we get the dimensions are 4h and l, and so the new area would be (4h)*l or 4hl or 4(hl).  So the area would be 4 times as much as it was before.

2/3x + 7 = 29

step-by-step explanation:

two thirds = 2/3

plus a number = x

at least 29 = 29

there for you should get 2/3x + 7 = 29

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.