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3 years ago

WORTH A BRAINLIEST I NEED HELP ON BOTH PLEASE EXPLAIN AND SJOW YOUR WORK!!

Mathematics

1 answer:

inessss [21]3 years ago

4 0

Answer:

- 4

Step-by-step explanation:

B .

-7 -(-3) = -7 + 3

start at -7 and move 3 to the right

difference is -4

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How much of an alloy that is copper should be mixed with ounces of an alloy that is copper in order to get an alloy that is cop

tekilochka [14]

Answer:

1r + 8(400) = 3(r+400)

1r + 320 = 3r + 120

2r = 200

r = 200 / 2 = 1000

1400 * 3 = 420

100 + 320 = 420

Step-by-step explanation:

4 0

3 years ago

$75 lunch; 18% tip what is the total

Ghella [55]

Answer:

88.5

Step-by-step explanation:

75 x .18

tip= 13.5

75 + 13.5 = 88.5

8 0

3 years ago

Solve the system of equations using substitution 4x + 2y = 16 =−12+5

mario62 [17]

Answer:

$x=\frac{70}{11},\:y=\frac{20}{11}$

Step-by-step explanation:

$\begin{bmatrix}4x+2y=16y\\ y=-\frac{1}{2}x+5\end{bmatrix}$

$\mathrm{Substitute\:}y=-\frac{1}{2}x+5$

$\begin{bmatrix}4x+2\left(-\frac{1}{2}x+5\right)=16\left(-\frac{1}{2}x+5\right)\end{bmatrix}$

$Simplify$

$\begin{bmatrix}3x+10=16\left(-\frac{1}{2}x+5\right)\end{bmatrix}$

Isolate x for 3x+10=16(-1/2x+5): $x=\frac{70}{11}$

$\mathrm{For\:}y=-\frac{1}{2}x+5$

$\mathrm{Substitute\:}x=\frac{70}{11}$

$y=-\frac{1}{2}\cdot \frac{70}{11}+5$

$-\frac{1}{2}*\frac{70}{11}+5=\frac{20}{11}$

$y=\frac{20}{11}$

$\mathrm{The\:solutions\:to\:the\:system\:of\:equations\:are:}$

$x=\frac{70}{11},\:y=\frac{20}{11}$

3 0

3 years ago

Jon is decorating a banner for a parade.Jon uses a piece of red ribbon, wich is 3/4 yards long.Jon also needs blue ribbon that i

Natali5045456 [20]

Answer:

3 3/4 yards

Step-by-step explanation:

To find the amount of blue ribbons, multiply 3/4 yards by 5 which is 15/4 or 3 3/4 yards of blue.

3 0

3 years ago

Eight less than the product of eleven and a number is negative nineteen. Find the number

likoan [24]

Answer:

-217 is the answer.

Step-by-step explanation:

negative nineteen is -19

eleven = 11

and from their product we have to subtract 8.

so,

-19×11

= -209

-209-8

= -217.

hope it helps you 

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7 0

3 years ago

Read 2 more answers