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lorasvet [3.4K]
3 years ago
8

(30 points) Solve for x: -4x+8=42

Mathematics
2 answers:
ra1l [238]3 years ago
7 0

Answer:

-8.5

Step-by-step explanation:

-4x+8=42

42-8=34

34/-4=8.5

densk [106]3 years ago
3 0

Answer:

x = -8.5

Step-by-step explanation:

minus 8 on both sides and the eight should cancle on the left side

42 minus 8 is 34

then you divide negative 4 on both sides

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Answerrrrrrrrrr??????
kumpel [21]

Answer: 1/b6

Step-by-step explanation:

3 0
3 years ago
There are 28.35 grams in an ounce and 2.21 pounds in a kilogram. Miriam converted 7 kilograms to ounces, but her answer is not c
Serggg [28]

Answer: C

: Miriam multiplied correctly, but her third fraction should be .S

Step-by-step explanation: Miriam used the unit conversation upside down. The 7000 g should have been multiplied by 1oz/28.35g

The grams cancel and the division of 7000 be 28.35 results in 246.91 oz Round to 252oz.

Alternative: 7kg (2.21 lb/kg)(16oz/lb)=252.5oz

The kg and lbs cancel and the amount of ounces remains.

3 0
3 years ago
Evaluate the expression when c=-6 <br> c^2+7c-5
xz_007 [3.2K]
 -5.16666667
first you have to subtract c from both sides.
0=-6^2+6c-5
0=36+6c-5
0=31+6c
then subtract 31 from both sides.
-31=6c
then -31 divided by 6
8 0
4 years ago
A triangle has an area of 240 square Inches. The height of the triangle is 15 inches. What is the length of the base of the tria
Alenkinab [10]

Answer:

32\:\mathrm{in}

Step-by-step explanation:

The area of a triangle is given by A=\frac{1}{2}\cdot b\cdot h.

Substituting given values, we have:

240=\frac{1}{2}\cdot b\cdot 15,\\480=15b,\\b=\frac{480}{15}=\boxed{32\:\mathrm{in}}

7 0
3 years ago
Read 2 more answers
For the function given​ below, find a formula for the riemann sum obtained by dividing the interval​ [a,b] into n equal subinter
Nata [24]

We split [2, 4] into n subintervals of length \dfrac{4-2}n=\dfrac2n,

[2,4]=\left[2,2+\dfrac2n\right]\cup\left[2+\dfrac2n,2+\dfrac4n\right]\cup\left[2+\dfrac4n,2+\dfrac6n\right]\cup\cdots\cup\left[2+\dfrac{2(n-1)}n,4\right]

so that the right endpoints are given by the sequence

x_i=2+\dfrac{2i}n=\dfrac{2(n+i)}n

for 1\le i\le n. Then the Riemann sum approximating

\displaystyle\int_2^42x\,\mathrm dx

is

\displaystyle\sum_{i=1}^nf(x_i)\dfrac{4-2}n=\frac8{n^2}\sum_{i=1}^n(n+i)=\frac8{n^2}\left(n^2+\frac{n(n+1)}2\right)=\frac{12n+4}n

The integral is given exactly as n\to\infty, for which we get

\displaystyle\int_2^42x\,\mathrm dx=\lim_{n\to\infty}\frac{12n+4}n=12

To check: we have

\displaystyle\int_2^42x\,\mathrm dx=x^2\bigg|_2^4=4^2-2^2=16-4=12

7 0
3 years ago
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