Answer:
I think that is the answer to this math work 5 × 3= $15 7 × $4.20=$29.40 All together it will be $44.40
Answer:
In both cases, if the signs of the initial numbers are the same, the answer will be positive. If the signs are different, the answer will be negative
Step-by-step explanation:
Required
Signs of results of multiplication and division
If two non-zero numbers have the same sign, and they are multiplied together, the end result will be positive.
For instance:

2 and 4 are positive; so, 8 is positive

-2 and -4 are negative; so, 8 is positive
If two non-zero numbers have different signs, and they are multiplied together, the end result will be negative.
For instance:

-2 is negative, and 4 is positive; so, -8 is negative

2 is positive, and -4 is negative; so, -8 is negative
Answer:
C
Step-by-step explanation:
You just find the rate of change. So you would divide 30/1 which equals 30. So the equation is y=30x.
F(-1)= -3 is (-1,-3) and f(2) = 6 is (2,6) where f(x) = y
y=mx + b is the slope-intercept form whereas m equals the slope (rate of change) and b equals the y-intercept (initial amount/what y is when x is 0.)
First, we need to find the slope between the two points (-1,-3) and (2,6). To find the slope we could use one of it's formulas

.
1. (-1,-3)
2. (2,6)

→

→

The slope is 3 (

). Thusly, y = 3x + b
To find out the y-intercept, we can reverse the slope. [Note: This

is in

where rise is 'y' and run is 'x'. Reversed would be

]. Take the second ordered pair and use our reversed slope on it until we get 0 for x.
(2, 6) ⇒ (2 - 1, 6 -3) ⇒ (1, 3) ⇒ (0,0)
Y-intercept is 0. Therefore,
y= 3x + 0 [NOTE: y = f(x), so if you want it in function notation form it's just f(x) = 3x + 0.]
The area formula for rectangles is lxw. To solve, I would divide the figure up into 3 rectangles- top,middle and bottom, then find the areas and add them together.
Top: 4x13=52 cm^2
Middle: 5x8=40 cm^2
Bottom: 21x10=210 cm^2
(5 is the width of the middle piece. You get it from subtracting. 21-8-8=5. 13 is the width of the top piece. 5+8=13)
52+40+210
=302 cm^2
So your answer is 302 square centimetres.