In making a lawn in the garden, the cost of fencing is $20 per metre and the cost of flower -planting is $50 per metre square. Let x be the length of a side of the lawn in metres.
(a) If $ F is the cost of constructing the fence, find a formula connecting F and r.
(b) If $ Pis the cost of flower-planting, find a formula connecting P and x.
(C)
If $ T is the total cost of making the lawn, find a formula connecting T and x.​

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.

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is:

answer: (-6,3)

step-by-step explanation:

answer: answer is b.

[m < b = 120º]

step-by-step explanation: